1st Gen F-Body spring rates

[XcYZ]

Hey guys, I was wondering what you're using for spring rates in an aggressive street setup. I currently have 175 lb/in leafs and I'm leaning towards 550 lb/in coilover, maybe even 600 lb/in now that I have the twins hanging on the motor. I'm curious as to what you guys have for spring rates and what you think of them. I've never had a 1st Gen that will be this stiff spring wise.