Small block compression

The block appears to be a 78 318 w/ 71 360 j heads. I don't know how the cam was installed because it was already in there when I got the motor. I had the heads rebuilt about a year and a half ago. That was the last time it was opened. The short block was not rebuilt. I did notice that it was already .030 over and had a step in the walls. I didn't want to have it rebuilt, for me it wasn't worth it. I'm building a nice 360 for it. Just want to know what might be going on tin this engine.

-Alex