Head Gasket Suggestions

Cometics MLS type? All of them MLS gaskets require a high RA (smoothness) on the head and block but I think iron on iron are an exception as the AL on iron block heads expand at a different rate and can stress a gasket in a sheering force, the MLS gaskets and the high RA finish prevents this type of stress. Iron on iron expand at the same rate, so there is no sheering force on the gasket.