what CFM would you use here
CFM ratings can be apples/oranges. Different levels of depression were used by different OEMs and carb manufacturers. Here's a little light reading
http://www.candsspecialties.com/ratings1.html
With a mild 360 with street gears something like an Edelbrock 1406 will probably fill your needs. If you're inclined towards Holleys, try this
http://holley.com/applications/CarburetorSelector/CarbSelection.asp
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