Qjet may be a factor, just wanted to post a real world experience with a 120gph mech pump supporting over 500hp when it was said these pumps will not support "anywhere near" 500hp.
Back in the early to mid 90s i had a mild 455 (462) in a 78 t/a with a holley dbl pump mech secondary carb, milled .030 6x4 heads, 280 magnum cam, headers, 2.5" exhaust, th400, 3.90 gears. that car ran stock lines & pickup with a stock large canister AC mech pump... it was never dyno'd or went to the drag strip but on the street it would beat mid 12 sec cars that would come cruise our avenue with time slips in hand, i would easily beat them on stop light to stop light short runs and when we went to a divided highway section we had marked for 1/4 mile, it would beat them the entire run... that was my only verification for how fast the car was, im sure it would run mid 12s or better with good tires. I would guess at least 425hp on that motor that ran great on the street with stock pump & lines. The 120gph pumps can & do support 500hp engines.
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