My 91 Caprice had the "soft ride" option. Looked bad. I ordered front & rear SS springs. It dropped it about 2 1/2 inches. Especially in the rear. Also installed 9C1 sway bars. The front SS springs were about 4 inches shorter but the coil was 90 thousands thicker. So it of cousre not only lowered it, it firmed up the ride. My parts friend that ordered them had a Caprice & he installed Ibocs on his. His car would bottom out on the stops. Mine never has. Also got Poly bushings from Manny, Moe & Jack. (Pep Boys)
I installed new Monroe gas shocks last month & it raised it about 1/2 inch. I may cut a 1/2 coil off the fronts.