I dunno, but I think port size, velocity, etc. is all moot. CFM is CFM. it's a measure of volume per time. the more volume per time you move, the more power you can make, regardless of whether it's a super high speed velocity port with small cross sectional area, or a big fat wide port with very slow speed.

(obviously, as long as speed is fast enough to not cause the fuel vapor to fall out of suspension, and not so fast that you go turbulent)