Well..that's quite an intake. What you suggest isn't impossible, but it'll be a lot of work. Most aftermarket (I'm hesitant to say all since new stuff comes out every other day) EFI processors are speed/density but they are far superior to Ford's units. They are speed/density but they are fully tuneable. With some know-how and some time your car could run better than with Ford's mass air system. It's all a matter of finding out where to set the timing curves, fuel curves, etc. Good luck man. Once it's together I'd like some pictures.
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1984 1/2 GT350 (#842 Hatchback w/ T-tops), 302HO, Comp cams Xtreme Energy cam, Carter 625cfm carb, Weiand Stealth intake, MSD distributor, MSD coil, FMS 9mm wires, 1 5/8" MAC unequal shorties, 2 1/2" MAC Prochamber H-pipe, Flowmaster 2 chambers, KYBs, 16"x8" 4 lug Cobra Rs, Falken 245/45ZR16s