How to build a 13 second 340 Duster

1972 Duster 340. .030 over, speed pro forged pistons, steel crank(stock), Hamburger windage tray and 8 qt pan(run 7 qts), stock balancer, stock rods, CR is a true 9.02 to 1, 915 'J' heads ported (254 cfm @ .550), Mopar solid 284/.528 camshaft, installed @ 110, actual lift with lash = .538 as installed with Harlin Sharp rockers 1.65 ratio, 5/16 Comp chrome moly pushrods, Edelbrock true roller time chain and gears, Holley strip Dominator single plain, Holley 4779 750 DP, 1" open phenolic spacer, crancase evacuation system (moroso), Hooker Super comps 1 3/4", 727 with 10" TCI 3500 (stalled 3200) in my car, 4.30 gears, stock suspension with the front half clamped and the rear section open, stock wheels, Indy street tires, six-pac scoop with air box sealed to hood,(worth .20), all steel body and full interior. Would run 11.70's everyday, Best was 11.61 @ 114.47, 7.50 @ 92 in 1/8, 1.66 60ft. Ok on the street but didn't pull hard untill 3500. Wanted more street manners so I changed cam to XE275HL, Manifold to RPM Air Gap, changed rockers to Crane 1.6 ductile iron, Carb to Holley 3310 750 Vacuum sec, and 3.91 gears. Now runs 12.25 @ 110.71, and 7.85 @ 87 in 1/8. with 1.77 60ft. And is so much easier to live with on street. really turn key now not much to do other than change oil. Just thought I would throw that out there. Terry.