I've pushed the piston to the side and slipped a feeler gauge down the sides of the bore to see what the gap is. I can get a 0.010 feeler down the side as a tight fit which doesn't sound like the bores a worn much.

Maybe I'll just get a new set of rings and try it out...

For those who believe, no proof is necessary.
For those who don't believe, no proof is possible.

41 Chevy