heard good things about the ls7 set up.. they sell them at Kyspeed.com
http://kentucky-speed.com/gm-gm-ls7-...83d5af3d16da2f
and ive heard many of horrors about the spec3 but ive also heard good things.. soo thats a hit or miss apparently.. im looking to do the LS7 Swap soon too maybe after the winter...