Clarification

"These are all the early engines, the only one to avoid are the 2002's unless you can hear it run. "

If you are going to put darton sleeves & good rods in it then the 2002 block is fine. GM had some issues with the sleeves in the '02 engines - if its still running now 9 years later - its most likely good.

51 GMC 4.2 turbo
Can't solved today's problems using the same technology/thinking that created them