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Being that you have a 49 F1 Six Cylinder, the complete gasket part number is 7HA-6521. You will find that this gasket is very readily available because it was also used on the Ford N Series tractors from 1939-1952 under the same part number:
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.