NEVER put a 750 on a 318........

mopar head said

That`s if you take this guys info as gospel.
4160-C seems to keep coming up as 600 cfm

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4160 is a model number indicating a non mechanical secondary Holley carburetor. Holley makes 4160s from 450 all the way to either 800 or 850 I believe. The list number is what narrows it down further.