(VIDEO) Suspension HELP for 70 dart swinger drag racing!

I'm not familiar with QA1 shocks so when you say full loose you mean full loose on the extension? If so IMO you're going the wrong way, you need to tighten it up to slow the lift in the rear. It hits the tires hard, picks the front end up and when it sets the front down unloads the tires.

I run a 28 10.5 and a 325/50 radial on my Dart with Cal Tracs, monos and Rancho 9 ways. My shocks are usually set in the 6-9 range. My bars are in the bottom hole with very little pre load. It's been 1.37 with this set up and will hopefully go lower than that with the converter adjustment. BTW my car has very little rear rise.