Is that damage in one cylinder or all of them? How far from the top of the cylinders do the scratches go? That will tell you if they are from a ring or piston skirt.

For now pick any junk from the skirts, give the cyllinders a few swipes with a glaze breaker, new rings.and run it till you want to fix it.

:Edited after looking at your pic again. Those scratches are pretty high up, close to where the top ring rides.