OK, so you're going to make me rebuild the thing. Are these engines worth rebuilding with a cracked head? It started steaming out the tailpipe, so I have to admit, it's a cracked head.

 

If you're lucky it will only be a bad head gasket. But if you go through all of the work to replace the gasket it would be smart to have the head checked out for cracks and to see if it's warped. I would also have it resurfaced while you are at it. Just my suggestion.