I must agree big motors, and good colors = high survival rate. Around here in the 70s there was 2 red, 1 black and 1 white hemi Cuda, 1 black and 1 purple hemi challenger. As far as 10% left maybe, but not hemi, 440-6 or wingcars. 65% of superbirds have at least been on a registry, daytonas are even higher. State registrations tell you nothing as many people have a dealers license, or just don't plate their cars. Lots of the good stuff still out there not for sale....yet.