i have a 5speed manual in my 89 firebird and its a little messed up. I'm looking into getting a new one. i was looking at passably putting a 6speed manual in instead. how much work am i looking at if any?

This is a good write-up for the T56 swap: http://www.skulte.com/T56.html

Or look at the stickey threads above the one on top is a very good set by set as well