Demand for those old parts is pretty small these days.
The original OEM's no longer make them so now it gets farmed out to whoever can be found that is willing to make this stuff.
I believe the orientals just copy the old parts with no real understanding of what is functionally req'd of the part.
I can not believe all the new replacement carburetors that they are manufacturing - 1940's 6 cyl Chevy single barrel carbs - who the hell would need one ?
But these guys are cranking this $hit out LOL

 

When you ordered your mechanical fuel pump, it should have listed what the output pressure was.
Some pumps are available with as low as 6 psi output pressure and no regulator is needed or required.
Look at Holley’s or Edelbrock’s website for their mechanical pumps and regulators.

Holley makes numerous in line fuel regulators that will work with any type of fuel pump.
Most are adjustable to set the fuel pressure exactly where you want it.
Does your fuel system have a return line to the tank?
If so, you’ll need to order the regulator set up for the return line.
If not you’ll want a dead head regulator for a non return line set up.

Make sure you order the regulator for a mechanical pump for a carburetor and not for an electronic pump or one for EFI.
You may not be able to use your electronic fuel pump with a mechanical pump regulator.

You can easily build your own solid fuel line from your mechanical fuel pump up to your carburetor even with an inline filter and regulator.

 

I have never seen a replacement mechanical pump with pressure stated on the package - aftermarket (performance) mechanical pumps YES.
Does a pressure regulator "care" what pump is feeding it - mechanical or electric (NOT electronic or EFI ) ?
Why is your regulator at the far end of the fuel log ??

 

After seeing a mechanical fuel pump on a $20K engine (with a carb no less!), I'm wondering: What advantage is there to having a mechanical pump, other than having more stuff that can be chrome? That fuel pump pushrod might be the last flat tappet in your engine, and we've seen how that goes.

An electric fuel pump (which the OP already has), can live in the fuel tank to remain cool (this would require a mod for the OP). Corvettes have been doing this since 1982. And regulators since at least 1984.

Having the regulator at the end of the fuel log like that ensures that fuel is circulated, to keep cool, and that the pressure at the carb is precisely metered. There should be a return line off of that regulator, perhaps it is not installed yet. Also, a regulator like that can receive a vacuum signal and adjust the pressure slightly, to give higher fuel pressure at WOT, for example. Buick 3800s (V6, EFI) have the regulator at the end of the fuel rail like that, too, with a vacuum signal.

Seems like the OP has a solution, and just needs a hardline connection to the carb. @lars has a whitepaper on fuel lines, with AN fittings and no rubber pieces, that end up looking just like @OldCarBum's excellent example.

 

Wow like we really need someone to tell us how to plumb a fuel line / pump ?
What did people do before the internet ?
Who in the world is going to install an in tank fuel pump just to drive their car !

 

If you haven't heard of @lars, I can't help you. Perhaps you enjoy figuring out every detail of a fuel line yourself. Or you can get a document that shows the best practices, part numbers, and tools. Whatever.

Literally anyone who has done an EFI conversion. Or is ready for an EFI conversion. Or has an 82 or later Corvette.

If your carb works, great! If it fails, you'll have a decision to make. Guess who you can ask to help you stay on the carb path.

 

I have heard of Lars and still rebuild my own carbs as I have for 50 years and yes thanks to Lars when I set-up distributors on my distributor machine I keep in mind his vacuum advance recommendations although I have my own method for a vacuum advance stop
I was going to have Lars build the identical # carb that I have on my car and then stop in at his place to pick-up "his" carb and have him test MY old carb and see how they compared.
Alas Lars did no want to deal with anyone out of the USA so he never rebuilt my carb
The fellow with the electric fuel pump is running a carb - NOT EFI !.
Funny how all these experts carry on about how GM uses tank mounted pumps not aware that when the tank pumps burn out GM blames people for not driving around with a full tank of gas to keep them cool LOL

 

Bikespace is correct about the placement of the pressure regulator.
He is also correct about using the correct push rod, especially with a new camshaft.
Using an incorrect material can eat up the rod or the camshaft.
He is also correct (don’t get a big head Bikespace) that I will be installing a return line to the bottom of the regulator.

Personally I prefer mechanical pumps but there are some advantages/disadvantages in installing an electric fuel pump on a carbureted engine.
Its really personal preference, however there have been many recently documented failures with mechanical pumps over the past several years.
Many leak or the diaphragms are failing even with new oem style pumps.
Holley’s had some bad reviews regarding their mechanical pumps so do your research.
I went with an Edelbrock mechanical pump because it delivers more gallons per minute than I’ll ever need, I can clock the input/output ports and they had five star reviews.

Edelbrock manufactures fuel pumps that work well with carbureted engines that have low output pressure built into the pump and the OP may not need a fuel pressure regulator.

I used all stainless steel lines in my build and all the fittings and the fuel filter are from Red Horse.
If Lars has pre-made solid fuel lines for an oem set up that you can install a filter and a regulator, I would be ordering a set.

 

Since this thread has now spiraled into the discussion about options..
After having multiple stock replacement fuel pumps fail (one exploding oil all over the side of my vehicle), and since I have a roller cam and needed a bigger fuel delivery system for my 406 I am assembling I decided to give TBI fuel injection a try and purchased the newer FI style baffled tank and in tank pump. I also intend to install my regulator in the same fashion as OldCarBum.

I can see the advantages (and disadvantages) of both systems as well as the electric and mechanical pumps. If someone has an original car id probable stick with the mechanical and add a regulator. My car currently has the holley deadhead style regulator without the return line and the carter pump and other than a couple failures in the last 13 years... To be honest the exploding seal on my last pump was caused by an unrelated crankcase pressure issue ive resolved.

 

Both systems work great.
What ever system you choose, just remember all fuel pumps are rated by the volume of fuel they flow and the pressure they build in the system.