Before you commit to replacement parts I suggest you get the car on the ground and check what you have against FACTORY heights. Adjust your for your wheel height as well.This car sits way too low for me and bottoms out on everything.
My 94 FSM (in the steering section) has these measurements for the Chevy and RM wagons:
29.4"-29.2 to top of front fender arch
21.9"-21.7 to top off rear fender arch (may be a different measure for a OCC}
9.9"-10.4" rocker panel to ground between front and rear wheels.
I do not auto cross or drag. I changed from the hotchkis drop springs to high (Lb) spring rate springs near stock height so my hitch (frame brace) would stop scraping on drive way ramps, speed bumps, etc Roads are bad in my area and I wanted full suspension travel more than whatever benefits a lowered car would have.
Just some suggestions from a sedan owner.