The 68 Dart 440, 3100 pounds light, had 5.13s (538s one time but nothing changed) went thru 1/4 at 122 mph and 6800 rpm. 1/8 mile never got over 5000. My 70 Duster 340 running F/Stock will run 5.13s on 9x30 radials like all the other cars in the nation.