fuel flooding

I am transplanting a 6.0 from a hd early 2007 old body style into a 1931 ford sedan I have changed to a cable throttle body older computer with 411 as the last 3 numbers in the serial and o2s turned off, vatss off speedway motors sells a set up 80 psi fuel pump and filter that has a regulator and a return line. The problem that i am having is it runs good until we shut down and try to restart it acts flooded if i manually regulate it by cutting power to the fuel pump it runs great. I think it is flooding out it seems to have a lot of fuelrail pressure????????????

Are you running it 80 psi? If so, too much pressure. Run it about 60 psi. The tune needs modified for a fixed flow rate fuel source rather than vacuum referenced variable. Flooding after shutting off is common if you have dirty injectors or a fuel pressure regulator on the fuel rail that is leaking into the vacuum reference port if your fuel rail is equipped with one.