Jim,
Just a note that you may find something of interest in your engine search by checking out the posts in our Swap Meet forum
Other Online Sources.
Another alternative would be to post an ad of your own in the Swap Meet forum
Truck Parts Wanted.
For previous conversations about engine casting number and serial number info, use the
Search the Site tool (either click this link or the one in the left main page margin. A very useful tool when searching for previous answers to questions you are posting.
Good luck in your search.

Dan