There is a guy on the Ford Truck forum called NumberDummy who was ford parts guy for 30 something years. He has all the books and answers questions all the time on that forum. He might help.
Don there's a dude that checks in here regularly, his name is Jody Alberts/Abbots (some help I am...) Anyway his avatar photo is that red 66/67 Fairlane in a huge wheelstand. He's steered me back in the groove a time or two, and if he doesn't know, he undoubtedly knows sombody who does.