I am running a Tanks Inc. tank with a fuel injection pump but I am also running carbs and this is how i did it.
my car had a 3/8 fuel line and a 1/4 vapor return line stock so what I did was remove the 1/4 inch vapor return line to the tank while keeping the 3/8 line then i ordered a pre bent 1/2 fuel line from fine lines and installed the 1/2 inch line, so now i have a 1/2 line for fuel delivery from the tank to a pressure regulator and a 3/8 line from the regulator back to the tank. From there I installed a Aeromotive pressure regulator with gauge and the pressure regulator came with two different internal springs so you can set up the pressure regulator to be used with either EFI or carbs so I installed the proper spring for my six barrel carbs adjusted the pressure regulator to 6 psi and I have had no problems.