I haven't used them personally, they are pretty new. Darin Morgan is the man behind the design of them. He used to be with Reher-Morrison, now he is with Profiler heads.
Call Chad and talk to him, tell him what you outlined here as your combo and he will help you out. He is a nice guy. Or you could post your questions over on his site. I believe he will answer you size question honestly not just try to sell you heads, he also does port and flow work if you have something already.
Curtis