i have a 94 and the gaskets went bad last summer, only 10,200 miles on em'...i think it has to do with how much the car sits and how much it is driven... i bought the car with 9000 miles and both previous owners barely drove it...i think they get pretty hot, so if they get hot then cold then hot then cold, and then sit...you get the picture!
i bought them online for $675 shipped...1/888-528-2200. the dealer had the same upper head gasket set for $1373.97, they wanted to charge me per gasket instead of the entire set...so definitely check these guys out if yours go!
there was a thread on here a few days ago about a four fin or three fin intake...and from what i understood the three fin intake was put on the later models of gen 1's and these don't burn the gaskets up as easily! so check yours out, it it has three fins...maybe you'll get lucky!