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I would replace all the external gaskets as well as the rear main seal. It may be cheaper for you to get a full gasket kit. You won't need the head gasket, but you will need everything else. All the rubber and gasket material gets old and hard with age.
While you have the timing cover off, take a look at the timing gear on the camshaft. They are made of a fiber material and though it's rare, they have been known to strip some teeth.
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.