Sorry, the parts will not interchange. You can us an early 70's Buick carb with the larger main bores (800cfm). They can be disguished as Pontiac carbs, I've built a few here for "special" applications. They are about as good as it gets for having an big cfm early style carb.....Cliff
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If you can read this, thank a teacher. If you can read this in English, thank a Veteran!
https://cliffshighperformance.com/
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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