carb size
hey kwk you may be right and you may be wrong. he didnt giv e his rpm operating range, which i am guessing should be around 6500. if thats is the case and you use the standard cfm formula of rpms x cu. in. divided by 3456 then you come up with the cfm of 700 cfm. i would go with a 700 as first choice and 750 as second choice. the 650 cfm is really too small of a carb for this engine. being a 383 and a healthy cam it really could use the 750 cfm. just my opinion chevy art