Did a rough compression estimate tonight after checking piston clearance @ TDC. It's not the most-exact measurement, but with a 70cc chamber and .025" gasket, the compression falls almost exactly at 10:1. While I was out there, I popped the balancer and cover off... hello, Milodon timing gears!
Bought today, those timing gears cost almost $440 by themselves, the pan is another $467 and the pickup (when available) was around $150. The pan appears used but the pickup doesn't, and though I didn't check closely it doesn't look like the timing gears have ever spun under power.