A f-body pan, or a new pan that they call the LH8 pan will help you in ground clearance area. The LH8 pan is hard to get ahold of from what Ive heard tho. Ive got the truck pan, and a f-body pan, just waiting to see which one Ill need.
Heres all you will need to know, and more about LSx pans.
http://www.ls1tech.com/forums/showthread.php?t=817787