Brian Martin,Freelance adviser
You need to "move into the neighborhood." Google forums where people are into those trucks. I don't have one or I would send you to it. But if it were a Chevy like mine (48) I could give links to forums that ONLY talk about them. When I had my 59 Rambler I had a few forums that ONLY talked about them too. You need to find something like that, or places where they sell parts to those trucks, they likely have a manual for you. But that is the trick to "move into the neighborhood."