If this is an 'old' engine, I would replace the damper. There is a fair chance that the outer rim has (or will) move in relationship to the hub due to deterioration of the elastomer material between the two pieces. This movement will cause you to never be able to time the ignition properly. The fact that you stripped out the holes, IMHO, just makes this decision easier. There are several sources to purchase replacement from, Summit and Jeg's to an outfit called Damper Dudes and even more. When (IF?)you purchase a new one, I do suggest that you go a few more bucks for an SFI approved non-explodable damper.

If this is a fairly new damper, a Helicoil repair should work fine.

Another thing to check - did you score the crankshaft when you pulled the damper off? Or is it scored from just seal to crank wear? If so, you will need a repair sleeve for a proper seal to the crankshaft.

And you thought it was easy???