Its all about instant center boys.
Keith Bell Fastest Stock suspension Mustang in the country 7.41 197mph - YouTube
This guy has basically the same set up you have Louis. No matter how hard you try you will need to modulate the boost to get it to hook. Most of the tricks to make a drag car hook is in the front end. Everyone runs a coil over in a stock front end Mopar. Not good, they limit travel and change where the springs acts on the car (torsion bar spreads the load to the center of the car). For simplicity Ladder bars are good and work pretty well but DONT RUN BUSHINGS! They make chicken sh&t out of chicken soup. Run Heim joints, its not worth scraping yourself or your Dart off the wall. Leaf springs too but you going to need to buy the Calvert set up and test over and over. Check this one out and its at Fontana which is known for its crap track prep.
www.shockertv.com PSCA Outlaw Johnny Coleman quickest leafspring pass in the country - YouTube