I have a real world test with a 2GC 2-bbl swap to a Q-jet, but on a mild 455 instead, and it is true, that you'll make more power with the 4-bbl induction. The difference in power on this 455 isn't as drastic as Richard's test, but eye-opening all the same. The 455 was a 1970 YH code out of a Bonneville, the standard 360 hp rated engine with the small valve heads with 9.95 to 1 compression which were stock (no porting), a Summit 2802 cam (224/234/114 @ .466"/.488" lift), stock log exhaust manifolds.
The 2GC made 323 hp @ 4500 rpm and 472 lb-ft torque @ 3100 rpm, while the Q-jet made 390 hp @ 4600 rpm and 512 lb-ft torque @ 3400 rpm. So, a 67 hp gain and 40 lb-ft torque gain pretty much throughout the rpm range of the pulls. You are definitely leaving power on the table all things equal...on the dyno. Those 2.41 gears won't let you use that power gain effectively until higher rpm, but you'll feel the difference. Adding a better cam, like a Summit 2802 with 9.5 compression, long branch exhaust manifolds, 2.5" exhaust system, 3.42 gears, along with the Q-jet & iron intake will net you 75 to 100 more hp over your current stock hi-compression 2-bbl engine.
Really nice wagon you have there, btw...
Dennis
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