How many CFM? '76 360 2bbl

Wondering if anyone knows how many CFM this 1976 360 2bbl is capable of?

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Came out of a '76 D100 360/727, 3.23 gears.

Has been stated that they come in 350 cfm and 500 cfm, this carb.

These butterflies and the bolt pattern are definitely larger than the earlier 318 BBD 2bbls that came stock on the 318s in '69.

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