A late model Q-jet or any that have the larger primaries are 850 cfm not 800, if you set the angle of the secondary air flaps as described in my book. I typically don't waste my time trying to explain all that even though the last time I looked it was 2024 and folks are still regurgitation old/outdated information with just about every topic we discuss on the Forums.
If your Q-jet gets outran by a 750cfm Holley or Holley clone on a 400 cid build at that power level for sure it was off tad someplace......FWIW....
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73 Ventura, SOLD 455, 3740lbs, 11.30's at 120mph, 1977 Pontiac Q-jet, HO intake, HEI, 10" converter, 3.42 gears, DOT's, 7.20's at 96mph and still WAY under the roll bar rule. Best ET to date 7.18 at 97MPH (1/8th mile),
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