Engine Damage: Part Out or Repair?

[slowbubblecar]

Off topic, but does a lot of detonation on a piston top ruin a piston? I have a block here that the hg was blown on and it had bad detonation. I dont think any of the numbers are really even visible on the top of the piston anymore. It still has good compression and the wall looks fine. I was going to sell it to someone for cheap before, but his unlce who is a mechanic said it isn't good anymore. His uncle is also supposedly a dsm guy and couldn't do a 6 bolt in a 2g swap either because they are too difficult. I wouldn't really believe him.