[banjoQ]

Oldntired raises a good point. These old trucks have been worked on by dozens of people over the years. Often times they used what they had on hand. Be prepared to do some detective work trying figure out what you are looking at. I would be surprised if you find everything as it left the factory. Trucks especially fell victim to the use what ya' got mentality. Not a bad thing at all when you think about it. Just another example of American know how. Mine started out as a 36" and morphed into a 36" with a 37" cab and a 8BA with juice brakes. When asked why a 37" cab was placed on the frame, the original owner said he thought it just "looked better" Go figure.
After looking at the photos closer I am thinking your truck might be missing the grille shell? Is that the top tank of your radiator showing? Those were pretty grilles and could have been pirated some time back. I hope not for your sake. Be sure to take a few more photos and post. Would be very interested to see more.