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427 cid at 8000 rpm and 100% VE would pull in 988 CFM of air. 1500 cfm is half again what you need. Too much carb may cause low rpm throttle response issues, but as long as the AFR is correct, it shouldn't matter above 3000 rpm.
You should be around 12.5:1 AFR at WOT to make maximum power. Timing should be in the 35-38 deg range all in by 3500 rpm at WOT. If these are correct, then it is flow issues. It is my opinion that you just do not need a radical cam with good flowing intake, heads, and exhaust. The better the engine flows, the more a radical cam kills the low end, often without gaining anything at maximum rpm.
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