Has anyone used Intrax lowering springs? Any thoughts? I'd like to lower my '69 about 2" and they are closest I've found to that dimension.

http://www.chevelles.com/showroom/data/500/medium/IMG_3594.JPG

The information on Intrax website sure makes it sound as if they're good...do I understand correctly as far as they being progressive rate?

Has anybody tried them?

http://www.intraxsuspension.com/prod_springs.html

http://store.summitracing.com/egnsearch.asp?SearchType=Make&N=4294908216+4294908021+4294924707+4294925130+4003 55+115+300555&autoview=sku