Hi DT...Yes, the Caddys are well known...There have been reports of mary kay camaros being built during 68 and in 69. Did your grandparents special order the car or buy it off the lot?... If you want to get some more definitive information, I'd suggest posting on camaros.net, Kurt S. has a lot of info. Be sure to include all your cowl tag info, if you do.