I discussed getting a second motor, but it was a non-starter with my better half. Part of the problem is that the aluminum block that's in my car is a bit of a rarity only being used in Z3's so spares come at a premium ~$2k for a untouched salvage yard motor. So, I'm making this as legal as I can. As I mentioned, there's an oe gasket solution, because the head and deck have been shaved for flatness not neccessarily for compression. It's just that I don't trust the gasket manufacture.