Copper Gaskets

I disagree. The slant only has 4 head bolts/cylinder and they’re only 7/16”. It’s actually hard to keep gaskets in a boosted slant, even at 5-8psi. I have a lot of experience with engines in positive pressure (although never done a slant) and I would not build one for boost without mls gaskets and studs.
I wonder what all @Charrlie_S has used on his in the past?