CFM is volume of air not velocity.
We are talking about a 360 not a 408 and we are talking about a street car that might go to the track once in awhile. I will take a carb that will give me the best response in the rpm range I am going to use it the majority of the time and for a 360 that won't see the high side of 6000 rpm that is something in the 650 to 700 range.