750 CFM
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a 600 or 650 CFM. carb will work great on that engine.
i need vacuum diagram for a carter abf competition 8867
About 500 cfm
750
11 1/16"
from my experience the 750 cfm will dump too much fuel you should go with a 600 cfm. i prefer the holley. you should only go with a 650 or 750 cfm if you have 400 horsepower of more.
Ubbv
It is 8867/10000 as a fraction
It varies, but most are around 800-850 cfm.
the carter carb, they suck. get a weber. you'll thank me later.