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Go with the 1.66. You're talking +.010" (.005" per side). If that's too much, you can always chuck it in a valve machine and cut it down but I don't think it will make that much difference.
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.