'69 455 Cutlass, aum. heads, steel hood, bench seat, aftermarket control arms.
Wants to know what lb. springs to order to give the car a decent stance and handleing??
Anyone with experience with this setup??

 

Are you talking about coilovers? The best way to figure out what spring rate to use is to do a 4 corner scaling of your car. Maybe out of the question, but you can learn a lot from this.

I have QA1 coilovers in my car with 450# springs. It is very stiff in the front, but with the coilovers, you can set your desired ride height very easily. I'm going to replace my springs for some 350# ones eventually.