I have S/S springs 002,003 on my 71 Scamp with 500 HP at the crank. Springs are move in with the rear shackle almost straight up and down with a little tilt back. I have my pinion at 5 degrees with the S/S springs. Now mine is mini tubbed with 28 x 13.50 dot slicks. You will have to watch what shocks you put on. The Mopar drag shocks did not work. They would not let the rear lift. I use Competition Engineering adjustable shocks. This suspension set up worked on my drag Dart and it works great on my Scamp.