If not install disk brakes, at least install a modern dual chamber master cylinder with front and rear brakes isolated. I would consider this a must!
I would really consider newer front brakes to match the rears. Disk might be overkill, but S10 front drums would be a great place to start if they ever had drums.
Overdrive will let you run with everyone else on the road, so you better be able to stop with them as well.
Joe
