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Only heads that are decent that can be used are are 351C 4v heads... good luck finding a set of those. Other than that youre stuck with aftermarket.
This is what i had done on my 400. GOOD valve job, mild port work, milled .040" (iirc) , energizer cam, headers, edeljunk intake and carb. After that it was "bearable", however someone dosed it with some sand would be my guess and spun a main. Dropped in the diesel and havent looked back.
This Hennessey Takes the Expedition Tremor's Off-Roading Capability to the Next Level
Slideshow: The VelociRaptor Expedition gains a lift, upgraded suspension, Brembo brakes, and trail-ready equipment while retaining the stock 440-horsepower EcoBoost V6.
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.