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What is your indication that the 750 is too small? It should handle your bad boy over its rpm range. Maybe it just needs a finer tune? As you know, double pumpers are not real good street carbs. If you are using it as a street/strip car, mostly street, I recommend getting a 750 vacuum secondary version. That will be MUCH more responsive on the bottom end and still give you the same top end performance.
 
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