318 head porting for the average joe

simple answer is NO.
Pushrod pinch(prp) is not as big of a restriction as it look. If your working on the short side radius (SSR), raising the roof, at the ssr and raising the roof at the intake/ head surface. THEN, the Pushrod pinch becomes a restriction. If you don't have a flow bench and can watch what happes, Don't Do It! If your not going to mess with the ssr, the prp, is NOT the smallest Cross Section in the head. there for, no cfm gain grinding on it.
Clean it up and leave it alone is my suggestion.........