If you want to stay with the 228 engine, I'd suggest finding another complete engine to rebuild. With the amount of damage that piston is showing, it's very likely that the block, the head, or probably both will have some cracks in them you haven't discovered yet. Finding one obsolete custom piston to replace the damaged one is about as likely as finding a chicken with lips. These old engines are tough, but they're not bulletproof. Most people in your situation would probably look for a 248 or 270- - - -they're both bolt-in swaps and are more plentiful, and more powerful than the 228. Send me a PM- - - -I might have what you probably should be looking for.
Jerry
