Welcome to the board!
What I am finding is that most of these diesel trucks were sold for commercial use, no doubt for their fuel mileage, and probably to some degree for their slowness, so company employees couldn't go tearing around everywhere. At least if they did, they had to work at it! <img src="/forums/images/graemlins/evil.gif" alt="" />
I'd say you are at the best site anywhere as far as info goes for the engines in these trucks. Other than the engine and it's related components, the rest is simply S10 stuff, and one place to visit could be http://www.s10forum.com.
The poeple on this site are great and very helpful, and since these engines are getting old, info is becoming harder to find all the time.
Best of luck with the restoration. <img src="/forums/images/graemlins/kewl.gif" alt="" />