I wanted the increased spring rate in addition to hitting a height.
Understand completely, same here.
I was mostly musing about the idea some people have that an unmolested G body today rides at the same height as it did new
I am fortunate in that I have an older TRW/Moog spring catalog that gives all the specifics as far as rate, free length, installed height, designed load, wire diameter, and ID of coil. I chose the 5660s for the rate , height, and load. I made the mistake once of installing new stock rate springs....way too soft for my liing