Thank you so much for the great information! The engine numbers are in a photo, as well as some longer views. The videos you sent are more than excellent, and from Bald Eagle 242's commentary and additional video, I think I have found the actual problem keeping this engine from starting and running. When I sprayed in some ether, it only popped at the intake. Didn't try to fire. I now realize it's likely that the intake valve is stuck open. I suppose we will need a head gasket. Again, thank you!