I came across an 87 Grand Prix today, 87000 miles, 4.1 liter,fuel inject., air,cruise,tilt,locks.windows,bucket seats with counsole. Lite blue on top then dark blue on the bottom, its a hardtop w/out a vinyl top. Everything works, including the power antena,it even has the original spare in the trunk. It has no rust anywhere. What do you guys think its worth?