Stuck pistons/Crank, any ideas?

I managed to get the cam out and now two pistons. The cylinders look fine so far. I can move the crank easily but rotating it has been a problem. If I could reach the last 4 nuts on the end of the rods, I could take the crank out and pop the pistons out.

I have a different wrench that might allow me to reach the last four nuts on the rods. Once done, the crank should lift right out and I can knock the remaining pistons out. So far the cylinders look good except for the ding.

On more question. I noticed that there is "ding" at the top, the ridge of a cylinder as if hit with a hammer. It is only the rim and has left a rounded mark where there was a ridge. Is this a fatal flaw for this motor? The rest looks good, not as much rust as I thought.