I've been working on designing an EFI fuel system for my 69' Corvette that will be converted to TPI in the near future.
Most of the solutions require a supply and return line with a regulator under the hood.
Being cheap and lazy , I would prefer to run the least amount of plumbing required for this install.
Looks like the LS motors in the C5 and up Corvettes have a 'returnless' system that only requires one fuel line to the motor.
The earlier C5s used a fuel filter / regulator assembly that maintains 55 PSI- Not sure if this is too high or can be accommodated via tuning?
The later C5s, C6 on up use a combination pump and regulator in the tank. I haven't been able to determine the pressure those run at but if the physical packaging could fit my stock C3 tank, that would be the cleanest solution. By the way, I'll be running the 12200411 PCM.

Has anyone attempted something like this and if so, how did you do it?
Any issues using this approach?
Thanks!
Elm