I'll do some searching, I have the numbers somewhere. On port sizes, the thinking at one time was "If in doubt, Hog it out". I have one Rapide with two front heads, 34mm porting and carbs, lightning cams , 9 to one. It was set up that way back in the seventies for sprinting. It goes OK but my other Rapide has stock heads, Shadow sized stubs/carbs & 8 to one compression. The small port bike makes greater power all over the range, even at top.
Now it seems the tuners are more interested in port shape than adding size, in fact too large of an intake port slows the flow velocity which in turn reduces the density of charge and greatly reduces overall power. Sometimes the gain may be there, but only at very high RPM where the flow velocity is high enough to create the necessary density of charge. This can work OK for some race bikes, but even there midrange power is needed coming out of corners.
I've noticed the Norton Commando Daytona tuners are now seeking older small port donor heads in order to get the desired shape for racing without ending up with a port that is too large. The big port Combat Commando heads that were in demand at one time are considered ruined by modern standards. Also, polished ports are out, ground finish is the new way for better atomization and swirl.
Its tough to argue with these tuners when they have dyno charts and Daytona wins to back up their claims.
Glen