318 Poly heads and stuff

Since you mention you have a Pavlovich engine, why not ask Gary about head porting. He's done a fair share of that as-has Bruce Toth on the east coast. Justin @ POLY318.com is another source (Poly 318 Cylinder Head Porting - Poly318.com.

You used the acronym "NAFF" so for the uninitiated, can you clarify?