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If it is a Holley look for a set of #'s on the choke horn, front top of the carb on the drivers side. These are the list #'s, then contact Holley or look on their website for the size of the carb. If I had to bet it would be a 500 cfm carb.
The list number that I gave to Holley came up with a Model 2300, 310 cfm carb. The motor came from a bus, so I figure it was set way back for fuel economy. Thanks
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.