I went to a car show in Atlanta this morning and came across this 82 grand national. The guys name is Tim and he has owned the car for 20 years. How rare are these and what are they worth. The power antenna didn't work and it had 100,000 miles on it. Looked extremely clean inside and out and from what I know stock. I plan on putting my 87 GN in some shows this summer and was wondering if anyone could help with those plaques with all your cars information. How do i get logos and such to add to the display?