How to build a 13 second 340 Duster

The adjustable valvetrain might have helped with the valve problem (should have read the valves seated in two spots). I think the solution maybe to check pushrod length. The sliders are in the trans, remove every other tooth. Passon? sell these or Brewer? The suspension was 002/003 SS springs, adjustable snubber, and long parts store shocks. The front suspension was 6-cylinder torsion bars, no front sway bar and worn shocks. Good luck and don't trick yourself out trying to meet your goals. Bob