What generally goes wrong with older corvettes?

[Hobbitling]

I'm looking at a 1990 Corvette with 60,000 miles on it. It appears somebody just let it sit in a garage for a long time. I'm going to get a warranty to cover it, but I want to know what generally goes wrong with them, so I can make sure the warranty covers it, or that those things are easy enough or cheap enough for me to do.

Also, I've been told older cars would go to 100,000 then roll over back to 1 miles. Did the corvettes do this? Is there a way I can tell, easily, if this happened with this car?