I'm a C4 and C5 generation owner and not as familiar with the older vettes. But here are some sites I found you may not have. The vette net could probably find what you're looking for. The others deal in the older cars it seems. If you find something in southwest Florida (Fort Myers area) there are several members of our club that own older vettes and I think they would be willing to help you out with questions, etc. Good luck!
http://www.vettehound.com/geo/classifieds.php?
http://www.thevettenet.com/Default.aspx
http://www.proteam-corvette.com/