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What is a 6 speed E4OD? Every E4OD that I'm aware of is a four speed.
Anything is possible with enough time and money. The bellhousing bolt pattern is not even close. You will need a custom adapter plate, and that's not going to be cheap.
+1 on the gear vendor overdrive. This will solve your problem for a lot less money. You will be very unlikely to achieve 400 hp on a speed density efi 460. Stick with what you have, and cut out the air horns, open up the exhaust ports a little, and go through the basics. Plugs, wires, fuel filter, and fresh fluids. A 400hp motor home will only create more problems. Your stock engine should produce about 240. With a little head work, and my other recommendations, you might see 280.
Rezvani's Latest Post-Apocalytic 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.