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For 1982, K does indeed mean C6, and behind a 300, it sounds right. I haven't seen a C4 in an 80-86 F-Truck with a 300, only C6's, and one AOD. The C5 was avalable in 82 and 83 F100's, behind the 3.8 V6 only.
Evan
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.