I should add that I had a lot of people question the approach of putting the regulator in the trunk next to the fuel cell (or inside the fuel cell in some cases) when I first started to help build EFI cars
the MPI 3.9L,5.2 and 5.9 gas engines have fuel pump modules in the tank with regulators built in. I don't know the year range, but a Corvette inline fuel filter/return regulator combo is and easy way and common way to retrofit an EFI fuel supply. I'm thinking part of the reason a lot of efi builds have the regulator close to the engine is because that is where it was located for use with carburetors. Plus it helps to sell a bunch more hose/tubing and fittings. If data logs show the pressure stays safe, it really doesn't matter where the regulator is.
