I ended up using Sanderson headers. Had to modify the drivers side quite a bit. They were great to work with, sent me a box of scrap bends for $20 to do the mods with. When they were were finally right I sent them back and they ceramic coated them for $120. Had them back to me in less than a week. http://www.sandersonheaders.com/ Not all of their LS1 headers show on their web page. Call and ask them to send you a catalog to see them all.

Good luck with the f-body manifolds

Pat