The entire bottom end... If that was worn enough to fail then I would be worried the other parts are not far behind, but that is just me.

The head I would send to a machine shop and have rebuilt and checked for cracks/warping ($300 or so). Find a new bottom end cheep from a running car ($50 - $100), change the crank bearings, rings, and hone out the cylinder walls... you now have a new well built motor and a spare head!!!

Raymond