Super Stock springs

After checking out the photos of my recent return to the track ,i noticed the car loads up on the passenger side on launch . I am presuming the rear springs are SS springs but i can not match the part nos .
Also it rides a bit to high at the rear.Rear shocks are Comp Engineering three ways.

Front torsion bars are from a 6 cylinder.Car weighs 2800 lbs. So i was thinking pull a leaf out of each spring and invest in a better set of shocks .Also try some bands on the front section of the springs.

Was going to buy some new SS springs ,,,but the last couple of sets i have seen shipped in from the states have taken a set, after a couple of meetings ..any advice would be a big help . Thanks from a very cold and wet England today