Pictures would help BUT, a few scratches on the pistons as you put the rings on is not uncommon and will not be a problem. Gouges on the piston would be a bit more of an issue. Remember the pistons don't do the sealing the rings do so make sure you gapped the rings first (you did do that didn't you?)
Pitting on the top of the piston is not a major issue on the engine you have but would be on something more revy and "precision" could have been caused by detonation in the past or just water damage from standing unused for some years.
I once had a hillman Minx 1500 and the top of the pistons were well pitted but the engine ran fine for many many thousands of miles, mine was pitted through water as the head gasket had gone and had been still running for weeks like it till I got round to replacing it

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