You may want to upgrade to the newer trans as it is stronger, AND will have the progressive lockup instead of the earlier lockup style that can cause issues with the swap unless you properly tune it, and allowing you to run a single computer
You will also need to upgrade your fuel pump (the TBI pump is not sufficient), obviously you'll need adapter engine mounts, an intake (MAF sensor), you'll need to come up with an exhaust solution (headers or stock manifolds), coolant hoses, Trans cooler is something you may want to consider, and a radiator cooling solution as the stock 5.3 fan probably won't work very well without ducting. I strongly recommend electric fans and using the stock computer to control a relay pack for the fans.
If you want AC thats a whole other ball of wax to add in as well. Also keep in mind if you have a 2 wire vs 1 wire alt setup how that all gets set up to work properly, and how (and to what degree) you plan to make your gauge cluster function.