magnum head porting / pushrod pinch area / etc

The general concensus is that stock heads are thin, and crack prone. The high powers of the world want you to buy aftermarket castings, but that is not possible. Too much $$ for a commuter truck.
The truck made good power with a 318, and good exhaust system. The 360 with cleaned up heads, and tweaked kegger intake manifold should run even better. I have the engine apart, I might as well spend a few hours in the name of efficiency....