Cylinder Head Choice

Spacegrass said
It’s got a 727, and unfortunately doing the porting myself wouldn’t be practical right now.

Stick with 318WILLRUN.
To answer you’d question above about where to get ported heads....
Shocker 185 Mopar CNC (Sold in Pairs) - PROMAXX Performance Products
I have a set of these and there good. Not to much head for a 318.