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Try a salvage yard. A '81 (plus or minus a year or two) F100, F150, or 250 with the same engine and tranny as yours could be the donor.
You'll want to make sure they give you everything from the firewall connector on out. We have yards here in SC that will even pull it for you - most everything is plug and connectors, it takes about 30 mins to pull the main harness of a wreck.
Note that if you get too far off in year model, there may be connectors on the donor harness that have no match on your motor - smog valves etc...
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.