Upgrading stock 1971 318 heads

Slantsix64, I will say this once on these three subjects and I will not argue with anyone.

1. I have cut heads .040 and .045 and NEVER required a different push rod OR milling of the intake. Never an issue either.
2. Flow trumps compression any day of the week and twice on Sundays.
3. Closed chamber heads do NOT perform as well as open chamber heads, all else being equal.