As I've covered before, you end up with column of air the size of the port, drawing thru intake with occasional gains in torque, proven by Mercruiser on various engines, most obviously w/Square Port Manifold on Peanut Port BB Chevy heads(a huge easily seen difference and probably the easiest to search for details on). & heard some Ford engines, that I never heard details on,
And step on bottom of port 'mismatches' is best as in turn fluids go to outside of turn & inside of turn is slow(think about boating on a river)