I just sold my 98 Zr2 a couple months ago to buy the Camaro.
As for the seats I worked in the factory in 98' and covered 250 seats a day
so if yours was built in Linden NJ then there is a 1 in 6 chance I did it
Good luck selling it as a whole they are built like a tank and a little 350 swap that truck will be an off road animal.