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You may need to sort out the mounting hardware and fan shroud (if you run a shroud) since you are dealing with a radiator for a 460 rather than your 351. The 460 is a big block and the 351 is a smallblock.
Yeah, the plastic tank units are notorious for that. The problem is fixing a leak between the core and the tank on these units is that the cost usually exceeds the replacement cost so it's just not worth the effort to fix it over replacing it.
The cross-members in the engine bay should be the same as in other F-series truck so I don't honestly believe you would have to worry about it fitting... the mounting be still be the chief concern.
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.