If that NOS unit is a fuel pump, then it will not work. I thought at first you were referring to something similiar to the Kenne Belle unit, which increases the voltage to the pump itself. You need a 255 lph pump at a minimum, and those frequently start running out of fuel near 500 rwhp, depending upon how much hp your drivetrain eats up. I run a walbro 255 lph in tank pump and a Kenne Belle BAP which easily handles 600 rwhp. Cheers.
1965 Cobra replica with twin turbo Dart block 331