I have a 1989 camaro and I purchased the drop zone lowering springs. Once I installed the new spring in the rear it actually raised the rear end 1/4 of an inch. I verified that both springs were sitting in the insulators / purches correctly. I then removed the new springs and installed factory springs with a coil cut out of them. It still didn't lower the car. I then cut an additional 1/2 coil. still nothing. Finally I found a set of eibachs and install them. Still nothing. Has anyone else ran into this issue or have an answer.

Not uncommon if the springs you replaced were the originals. Atleast I have heard it mentioned several times on here.

Very possible the original springs were sagging enough that the new/fresh aftermarkets were the same height. This is VERY common.