piston questions

C'mon guys you've wanted the story behind this engine, there it is. Please don't bail on me now
The rebuilt engine was also originally a CL buy, that I got conflicted stories about. The most believable one was that they'd bought it from a junk yard and bought the wrong one for their application and were trying to get their money back, as the junkyard wouldn't. I pulled it apart because of those conflicting stories I definitely appreciate the feedback I've gotten so far.