Cooling Difference in Aluminum heads?

I was pondering what I may encounter. I put eddy s on my 380 h.p. crate motor with comp rollers. No cr ratio gaskets added. Gasket matched. Ported. M1 intake ported and runners cleanup up etc.

All new experience with me.

Engine masters boasted a 92 hp gain with
Light h eadwork on their 360.