I thought the SS leaf springs have a shorter and stiffer front section that require the use of a longer front spring hanger, and that they are designed for drag racing. The HD springs are designed more for handling, are slightly stiffer than stock, but should not really change the height of the car much unless the stock springs are drooping. The front torsen bars could be used if you want the weight transfer whilr drag racing, but on the street you want stiffer torsen bars for better handling as so the car dosent bottom out everytime you go over a dip.