If the car was set up to use real SS springs and someone installed B/E body SS springs they would be too long. Stuffing them in the car would raise the rear end (as yours is) and they would be bent over too far to compress over bumps. It would ride incredibly stiff.

I learned that the hard way when I put the 69 B-body springs on the 65. The 65 main leaf is shorter. The springs were nearly inflexible.