Dragoneye,
On a similar note about changing an entire drive train, one of our Club members is swaping an LS1 and a 6-speed into a 1985 IROC-Z. It's an interesting swap, and he's doing a fantastic job. Here's a link to the project. There are a lot of posts, but take the time to brouse through the whole thread, I think you'll be very impressed.
http://www.mifbody.com/vbulletin/showthread.php?t=6202