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My old days self learned rule of thumb----------starting jet sizes for Holley carbs worked out to be in the region of jet number sorta matching carb CFM ratings----IE-your 750 cfm carb I would begin with around #75 jets in the primaries and more times than not---would start with a 4.5 power valve just to be able to work on the normal driving tune before then advancing into the hard acceleration and WOT stuff----------
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