the piston and sleeve should have no major scratches or noticeable marks, otherwise that would be showing that that area is seeing alot more friction than the rest.
If it's gone through a fair amount of fuel like you say it has, it would definitely be a good idea to replace the rod and the pin in the piston to be safe and not end up with a stretched rod, rendering basically the entire engine as useless as the "k" in "knife"
Good luck with your engine, sounds like you got a keeper for a few years!