91 s10 t5 transmission

[Chevy nutcase]

I was looking for a suitable replacement to make my 66 c10 a little more driveable. The sm420 works fine but its geared ungodly low. I've only ever used 1st gear once on a steep hill and I feel like I'm pushing it going over 55 or 60 as its running around 2500 -3000 rpms. I saw a few vids on YouTube making the t5 swap and it looks like a good option. Found a guy with a t5 in a 91 s10 2wd that's running and driving for $500. That sounds a bit high but maybe it's fair idk.