Just thought I'd pass along the link to the Lingenfelter Ebay add for their double springs...They are the same ones they use in their LT1 builds and are a revised version of what I use...I'm going on my 13th year with them! They are good to .630" lift...$69/set is just for the springs...you still have to buy the retainers, etc....

http://cgi.ebay.com/ebaymotors/Linge...spagenameZWD1V

--Alan