Cams choice, Low CR vs VE%

Let me see if I’m following here.

If I’m building a 318 and I need heads do I chose a 318 head and keep the CR up or a 360 casting and get the flow?

Every single time I pick the 360 head. All engines are a series of compromises. The engine with the least amount of compromises is always better.
That’s if I’m following your thinking.
Correct.