Just browsed thru to your question. Read your first response and don not agree. Muscle cars that turned 13 + were big blocks like the 406ci and 427ci Ford engines and the 428 Dodge and Plymouth engines, etc. I myself drag raced a 63 1/2 406ci Ford and had 11in. cheater slicks on the back. Times were 12.95 to 13.25 at 105-112 mph. What most people don't remember is that they weighed from 3650lb. to 3900lb. That was the biggest drawback compared with later cars in the 80's and newer.

Sources: q

No problem. Glad I could help. Have a great day and good luck at the track.