Let's talk about Super Stock springs

I just noticed in your original post that you bought these used, They may not be 002 and 003. Here is a list of the different SS springs made.

Designed to control torque roll, providing equal bite on rear wheels through limited axle windup. These springs don’t lock up the rear, but allow it to move, keeping the tires on the track where they belong. The rear springs listed below have a 20" front segment and require a longer front spring hanger bracket for B-, E-, F-, J- and M-Bodies (not included). Standard hanger brackets used on A-Body. With P3412002–03, the rear eye in frame is moved forward; Pinion Snubber is recommended. If using P4120863, vehicle will not be level at standstill.
4120863 right-2800lb car weight-pro gas
4120864 left-super gas bracket car
3412002 right -original 1968 hemi ss
3412003 left- use on modified cars and all race hemi ss. Requires rear shackle relocation on B body cars.
3690456 right- 3400lb car weight
3690457 left-including 1964-65 ss B- body
3690454 right-3800lb car weight
3690455 left- B- body
4120865 right-3300lb
4120866 left-E-body(barracuda-challenger) requires rear shackle relocation on B-body.
3690460 right-3600lb
3690461 left- E-body(barracuda-challenger) requires rear shackle relocation on B-body .