360 - Rebuild - Information & Opinions Needed

I'd be much more concerned with cross flow than low lift numbers.

I quit worrying about low lift numbers in the late 1980's. A 30* seat is an absolute waste of time and a power killer.
Well I guess your right if your talking aftermarket heads. The OP is using stock P-car heads. Just a 30* cut with no porting will yield significant
gains in the below .400" area.