If I wanted to rebuild the top end on my 327. Modern hardened valve seats, new modern hydraulic lifters. Would I have to install a new cam, and with the new cam would I have to install new camshaft bearings? With the new technology would there be a cam that would be better that the original. I don't want to change much else on the engine. No new intake manifold, exhaust headers, ETC just a good improved original HO 327.

 

Definitely put new cam bearings in. The isky 270 mega cam will pick up your torque noticeably sound a little better and still be driveable
Some port work or a set of tfs 175 aluminum double humps, headers will really pick things up. Will feel like a larger engine

 

A few of my wishes. On the older 327's you need to add high zinc oil because of the flat tappets and the engine has soft valve seats. I would like to eliminate these issues. With the double humps can I still use the original intake and exhaust. I guess rebuilding the heads would be about the same cost as getting newer heads?
Edit: Maybe I can live with the high zinc oil and flat tappets.

 

If the cam bearings are in good shape (babbit is not wore-no scoring or signs of dry running) then no need to change them. Millions of Hot Rodders have changed cams without changing bearings.....but they have to be in good shape.....AND, if you do change them, they have to be installed properly with the right tool.....and the engine really needs to be disassembled to do so.
The 327/350 cam is a solid old grind with the emphasis on old.......it runs pretty good, but there are better choices, the L-79 cam is a 55 year old design. The 270 Mega or the Comp 268H is a great goto cam, easy to break in.
The cylinder head question is solely determined by how original you want the engine to be. The L-79 66' in my Avatar had over 80 hours in the heads to make them flow what a Belly Button Edelbrock RPM head would flow. It also had a stock L-79 cam (This was an NCRS documented car in 2005).....but with 1.6 rockers to compliment the heads, $2000 worth of work.....this was a hard running 327 for what it was.....mid 13's.....but I could have made more power with a different aftermarket head. The Trick Flow "DH" (double hump) 175cc head is very promising......Mark Vortec Pro made crazy power with a set that were ported, and I have a set on my bench for a customer that is going on a 69' L-46 350 rebuild.....
The hardened valve seat question is solely $$$$ as well.......if you put 2000 miles a year on your Vette, it is a waste of money.....if you drive it everyday, have it done.

Jebby

 

The cost of doing a set of Camel Backs to work like the TFS head would be about double.
Now I have gasket matched and bowl blended the GM head and had nice 5 angle valve jobs done on them and they run surprisingly well......but not quite 400 hp.

Jebby

 

I do like the TFS heads. Would everything bolt back together with these heads, accessories, temp sensors, intake, exhaust ETC?

 

Yes to all except the temp sensor hole.....good question and I am not sitting in front of the head. I will look later.
The heads are available with and without holes at the end......determine what you need.
Premium pushrods and rocker arms are recommended.

Jebby