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You may have electric fuel pumps ala EFI. Ford did this with some 460s and called it the "hot fuel" option. If so, try turning the key to run without cranking the engine for a bit before you try to turn it over. The electric fuel pump will have a chance to bring up your fuel pressure this way. At that point it should start easily, like you've driven it recently. If that works, start thinking about why the system isn't holding pressure rather than thinking about rebuilding the carb. If drivability and power are good, then I would leave the carb alone for now.
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.