Just got off the phone with J., the guy who did the exhaust. Just from what I explained to him, he's got the feeling that at worst case scenario, that I may have rolled a bearing or something has happened that is allowing the crank to move. Tomorrow before I take it up to storage I'm gonna check crank play and see how much movement I get. I just got his quotes for a fresh 360 and 904 rebuild too, just in case.
Timing sucks on this. It really does.