There are different weight SS springs. My Volare had been converted over to A-Body springs by a prior owner. They're very close, just needs a different front spring box. Didn't even discover it until we went to put the CalTracs on, with the *proper* spring!
I ran SS springs and a pinion snubber for a million years (still do on my bracket car), but it might be cheaper in the long run to just get the CalTracs once and be done with it. Alex Denysenko is a dealer for them, and can also help you with setup advice.
http://www.moneymakerracing.net/home