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Try posting your questions on one of the site's tech forums for your year. Members there will be able to help you.

FTE has a local chapter for WA Ford owners. You can find the chapter and introduce your self here,,, Washington Chapter - Ford Truck Enthusiasts Forums
You may be able to find weather stripping on LMC Truck website.
Great to have you as a member, enjoy the site.
For info on weather stripping use the Bed Covers, Tonneau covers, Toppers/Canopies and Bed liners forum: Bed Covers, Tonneau covers, Toppers/Canopies and Bed liners - Ford Truck Enthusiasts Forums
For your other truck info here is the link to the 1973 - 1979 F-100 And Larger F-Series Trucks forum: 1973 - 1979 F-100 And Larger F-Series Trucks - Ford Truck Enthusiasts Forums






