Jim, I know there is high temp flat black for exhaust. I don't know if regular engine paint would hold up to high exhaust temps, especially closer to the engine.
Good Luck Travis

Nice collection, I have just recently gotten into the vintage Deere sleds after riding my Dad's as a kid I can only hope to have a collection like yours someday. They all look nice and I love to see people are out riding them, I hope to have at least one of mine operational soon, but all need plenty...

I think I would try the helicoil, I have had good luck with them in the past. Happy New Year and good luck Travis