I called holley awhile ago and they tell me this thing supports 275 hp and i need a 1000 dollar 4 bbl setup for that much power.... I got a buddy who bolted one of these things to a high hp 383 and had no problems with fuel starvation. All the efi techs tell me its all in the computers fuel map. the injectors are 85 pph (biggest holley makes) so i put a 45 psi high pressure fuel pump on there and hoped it would be enough to feed 400 hp. stock fuel pressure is around 8 psi and holley says 275 hp at 8 psi, so 45 psi has to be enough right? the guy that built my motor says it makes 400+ on the desktop dyno and 425 ftlbs. I did the math and compared how much hp all the mods add and this thing should make over those numbers right? I still don't know if it will run lean or not. It has a cam, heads, manifold, 10 pistons, headers, k and n, with the holley tbi and accel 45 psi pump. Do i need more than the high pressure/flow fuel pump to handle the fuel demand or will that setup do it?