2 sets of heads for sb. can you help?

Well, with those particular heads, it is not about total port flow, but port velocity. In other words, gettin the air fuel mixture there quick. That's what these heads were designed for. As long as they are used in their element, they will work great. And with someone that actually knows and does port work, instead of just blabbin about it, they can be made much more than what they are stock. I could build a stock unported 302 headed 318 to eclipse 400 HP real quick. A 400 HP 318 in a 64 Dart that would hook up would be one tough BEEOTCH to come around on the street. It would not happen around here. No one would ever believe it was a 318 either. Honestly, until you get large by huge in the carburetor and exhaust department, head porting is really not necessary. The trick to buildin a good unported motor is smart head choices. The 302 head casting (considering they are uncracked) IS a smart head choice. It's really that simple.