First off, since this is your first post, Welcome to the Stovebolt!
While waiting for others to answer your question, maybe take a moment and head over to the Welcome Forum here Welcome
and put up a post with a little about yourself and your truck. You can also read other posts and get acquainted with those that have recently joined (often leads to very useful conversations).
Another very useful link (there are lots) is here Searching the Site
. You can use this feature to search the site for past postings about specific topics, like "Decoding Engine Serial numbers" and lots of others. Chances are really good, your topic has been discussed and others have answered those questions with resources and guides to help.
You can also take a look here The Engine Shop
for recent existing/on-going conversations about identifying your engine.
Again, Welcome! Look forward to seeing you in the forums.