With you having the fuel pressure set at acceptable levels for an engine with a carb. I can answer it two ways...Yes and maybe.
With you stating that you have no vapor lock issues I would say that you could leave it alone and drive and have fun. BECAUSE your current fuel system set up ( other than being an electric pump) is like that of the mid-year Corvettes. No fuel return.
But on the other hand, GM engineers changed the system to off-set the problems of the vapor lock issues and other possible reasons not currently being discussed or known.
Dealing with the fuel system I often times make sure that the decisions I make are that for the best of my customers safety,their investment and performance and ride quality.
If you have no issues, them roll with it.
You may want to install a oil pressure/ fuel cut off switch in the engine (like an '82 has) so that if you loose oil pressure your fuel pump will shut off. (safety reasons).
Having your fuel pump running off of ignition power can cause you to "have a bad day" if for some reason you are not able to turn off the ignition , but yet the engine has stopped running. i.e. AN ACCIDENT!!! It is easy (somewhat) to install and I can help you if needed.
When I was converting a '78 to an electric fuel pump and VATS security system. I talked to a fuel system tech guy who mentioned that if I wanted a fuel return, ( without using the factory pump as a dummy pump, which I ended up using for visual effect) that I could install a 'T' fitting in the fuel supply going to the carb, AFTER the fuel pump. The "T' block fitting would be so a 3/8" O.D. nipple fitting on two ports of the "T" block so the fuel line could be installed at the end of the fuel line by the engine and the last port on the fitting would be MUCH smaller. The fitting in the "T" block for the fuel return need to be 1/4" O.D. .....BUT..... The fitting must be brazed solid and then drilled out to about 1/16" if not smaller. This will make sure that you still have fuel pressure and some fuel return.
I have cut fuel pump fuel bells off and found that inside the bell, the fuel return line tapers down to a cone with a very small hole in it. The tube is not the same as the end that you would attach the hose on the outsdie of the bell. I have also found that on some new GM pumps, GM installed a plug in the end of the fuel return tube and the hole in it is very small. about like that of a standard straight pin for sewinig, (for example). Must have been a different suppliers that got that contract to make the pumps.
The only reason I did not go with the "T" block and fittings was the size of it when I put one together. I did not want to waste time making a fitting and when I found a way to make the factory pump work without working and not reduce fuel flow, I went with that method.
Hope that this essay helped....
"DUB"

 

I kind of like the idea of installing reducing tee in line. I will dwell of that subject for a bit, but I might try that, Thanks Gene

 

Because since got my car it never had one... and it's never caused an issue?

 

I belive that more likely the fuel filter with return line is too expensive...