I'll supercharge it down the track in which case a higher flowing head is benefical anyway..
If your going to boost it, then save your money. just about any reasonable flowing head, and I include with that any stock B series head, is going to flow plenty of air once you put an atmosphere or so of boost behind it.
Porting a head is all about flow path and airspeed, both are superflous once you add boost.

Cheers Greg..