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FAST's EZ-EFI 1.0 starts around $1800. One I forgot about is Professional Products' Powerjection.. $1750.
The others start around $2200. There are add-ons of course depending on what else is required like a fuel sump, bypass regulators, etc.
I went with Edelbrock's E-Street system because it has a wireless tablet interface and real-time gauges. The only thing I need to add is an oil pressure gauge. Otherwise volts, water temp, AF ratio, tach, etc... it's money I didn't have to spend on those items because they are built-in.
Btw, you'll need a 4V carb intake manifold for your 4.6.
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.