The 4.3 is a tough and long lasting motor. You should be able to get 200xxx miles out of it, at least. They are pretty powerful in a S10, and should be able to move the fullsize truck with no problems.
------------------
Lucas
"Another proud owner of one of the coolest trucks ever built"
drop_shift@hotmail.com
My Daily-Driver: '72 Chevy LWB Custom/10. Rebuilt 350, roughly 300 HP thanks to a 204/214 duration cam, Edelbrock Performer intake and 1406 carb, headers, and 40 seires Flowmaster mufflers. Ochre with a white top. Lots of fun
.