My combo is: 1972 340+.30, KB pistons,stock rods resized for arp bolts,484 purple shaft,eddy ootb open chamber heads,air gap manifold,750 vaccuum holley, getting fresh air from the six pac hood scoop,tti headers flowing through flowmasters all the way out to the tips,727 trans with manual valve body-and coan 3000 convertor. 8 3/4 rear with 3.73 gears with super stock springs and 11" drums. All in a 69 Dart weighing around 3200 without driver. Car has all original equipment intact. Best yet is 12.59 but usually in the 12.7-12.9 range and street driven.