Thanks for all the info. I may have found a spring, although I am fairly confident that I am now in the trial and error mode. I called Tamraz auto parts. They have a store on ebay. The guy I spoke to was quick with a spring because apparently another guy who works there has an award winning 70 Camaro with a 572. the springs he recommended are a MOOG part. They were only 90 bucks. Wish me luck.

The next challenge will be installing them. I have never changed coil springs. I am pretty mechanically inclined but I have been known to break a bunch of stuff on my way to figuring out the right way to do something. Advice is always welcome.