What is your goal? Might ping Spaz. I believe he is still doing the port work for APE.
Talk to the porters. You need a total package. The head needs to match the CCs, Cams, and Compression.
to add to GixxerHP list
Gann
Brock
Vance and Hines ( I believe Lee is using these)
Ward
Sharkey
Superbike Mike
Performace Porting
C&W