The Stovebolt Site Forums The Shop Area Engine Shop kill two birds with one stone...............I hope

First bit of free advice (worth what you pay for it): Jack up one rear wheel (chock the fronts), put it in neutral and mark the driveshaft on the side nearest the raised wheel (so you can see it while you spin the wheel). Mark the tire or use the valve stem to count revs. Spin the wheel 1 rev (slowly) and count how many times the shaft turns. Multiply that count by 2. That is your rear ratio. Maybe gears can be changed or maybe you can get a new axle... Or maybe it is just what you need.

Second: check out the tech tips. There are good write-ups on the T5 swap. Also do a search for T5 and read the threads.
The S10 box shifter fits better (closer to the front), but the World Class out of (some) V8 Camaros is stronger and has different ratios. You can build a hybrid from two boxes... Tailshaft and output shaft from the S10 on the Camaro box gives you the strong box with the forward stick.
You will need (at least) a new clutch disk to match the splines of the T5 input (11" Astro van comes up alot). The rest is installing... Trimming the bearing retainer, drilling out mounting holes to the right size, and maybe extending the splines a little for clutch play... Maybe fabbing up a trans mount.

That's a quick summary.... Do a little research and you should have no trouble.
Good luck