What head gasket for boost? MLS leaking oil

Sounds like detonation blew them out. Ten psi isn't that big a deal in terms of stress. "If" the decks are truly flat, and the proper cleaning ans torquing is done, I don't think a special gasket would be needed at all. Especially given the use of the head studs. Denonation on the other hand, can get through anything. You alreadu know the MLS needs the ultra smooth surface and there's no way the factory deck is there, so I'd just run s standard replacement gasket, and fix your tuning issue that's blowing them out. If you list the rest of the combo we might be able to give you a starting point for tuning.