Inliner Grant Galbraith wrote up a fine tech article on the T5 S10, it is posted at:
http://stovebolt.com/truck/techtips/t5tranny.htm

If you want to take advantage of the better ratios in the F-body (Camaro/Firebird) T5, there is another way to go, check out:
http://www.inliners.org/Jack/T5tech.html