I know the intake and exhaust ports are larger on the max wedge heads.
However, I was just looking at a couple sets of exhaust gaskets and put them up to the 915 head. It looks like the exhaust port opening on the gasket is larger than the opening on the head.
Maybe most BB exhaust gaskets are already opened to max wedge port size
If this is the case, I'd think the max wedge headers would bolt right up.