[BADGMC]

Use of a good mechanical pump with 5-7psi should work fine on a stock 454 with that hp kit. This assumes fuel lines are proper size for the pump with a good pickup in the tank. I had a blown SBC that made 550 hp with a CV Products mech pump.

As for the Racepump. I ran one on my current twin turbo blow through 383 and it worked great, when it worked. At first it was the o-rings on the piston that would go bad. I had to change them on the side of the road 3 or 4 times. I had the pump updated with teflon rings and that fixed that problem but upon a hard launch at the track it wouldn't pull from a rear fuel cell even under 1.50 60ft launches. The pressure would drop right at the shift to second gear right to zero. I didn't want an electric pump but had to go to one as it was too much of a gamble. Let me tell you there's nothing worse than rebuilding a hot fuel pump on the side of the freeway under a street light.