Do a bit of research before you jump. You need to make sure you get the right S10 T5 or if you get a Camaro one, you may have to verify the splines (there is a World Class and Non World Class with different spline counts). It isn't that hard, just know what you are looking for BEFORE you buy. The Camaro shifter ends up under the seat or almost there.
You probably want an S10 with a mechanical speedo to save grief but an electrical gauge and an electric speedo is easier to calibrate. At one point the S10 changed bolt patterns, though, and went common with Ford. I think 92 or so.
You can change tailshafts and get the S10 shift position into a Camaro trans. You probably will have to mess with speedo bushing if you do this, however.
If you shave off the end of the input shaft and trim back the throw out collar, you don't have to but the spacer. Search the HAMB for "Putting a T5 behind my 235" and you'll find lots of info (
www.jalopyjournal.com/forum) I suspect there is as much info here if not more because it will be truck related here rather than car but I'm more familiar with that thread.
Good luck.