When I first started going to circle track races in the 60's that was what they were using 30's, 40's and 50's cars. When I was going to dirt track races in the 70's and 80's you'd see 1st gen Camaros, Chevelles, Mustangs, Cudas and Challengers. Nobody thought anything of it they were just old cars. My first dirt car was a 66 Pontiac Tempest hardtop.