Not a problem. The early Buick 455 carburetors, 1971-74 are 850cfm units and among the very best starting points for a really nice high performance unit, especially for big CID builds and higher power levels. Almost all of the FAST Class Buick and Pontiac carbs I've built use those as the foundation and flow 897cfm when I'm finished with them. Some of those engines are close to 2hp/CID and the cars are into the 9's on bias ply tires.
So for sure a correctly set-up 7041242 Stage I unit would be about as good as it gets for what you are doing. Just have to figure out if it's a fundamental issue, parts issue, or a little of both.......
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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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