I have used a holley black copy cat pump with -10 to the pump, -8 to the regs (2 holley 12-803's, one for motor one for nitrous), -6 to the carb bowls and fuel noid...I ran a 125 and 150 shot, with 5.5psi fuel pressure flowing through a 73 holley jet, and I had no fuel pressure issues at all going down track.

That said, I am thinking of upgrading my pump over the winter to have the extra insurance on spray...maybe even a separate fuel cell if im really feeling the addiction lol