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the easy way to find out how much carb your car needs is to use the air flow formula.
(CID x Peak RPM x VE) / 3456 = CFM Draw of your engine.
going one size up from the airflow demanded by the engine is a good way to apply the results.
you will find that GM, like most manufacturers, oversized carbs from the factory. it is jsut an easy production line way to avoid minor tuning issues as the extra air flow made them more forgiving.
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