Intake Velocity Speed of 565 CID w/850 Holley?

^^This^^ CFM is a volume measurement.

At cruise an engine may be using a steady 100 CFM of air/fuel mix but the air speed from the carb to the cylinder may change several times before it dumps into the cylinder.
think about this: larger ports will flow more air at a certain speed, but a smaller port will generally have higher intake speed . read hughs porting tech pages . on heads and intakes. that is one reason I didn`t go full max wedge on my cnc`d raisd port heads. the intakes are a diff animal tho.