Bob,
I had a 64'GTO found & bought it when I was 15 ,my 1st race was a 66 442 w/tirpower ,I had a 4BBl 4-speed & he beat me by 3 bus lengths. So I went & changed timing chain,tweaked the carb,advance the timng ran it hard & blew out the carbon & ended up beating him,along with any 383 Roadrunners,340 Dusters,396 Camaros.