Joe, you could keep the throttle body air valve to maintain a semblance of a period correct appearance, sell off the pieces of the system you are not going to use and replace it with the Pro-M EFI. That
Universal Hot Rod kit is nothing short of awesome. With a sealed can to replace the air cleaner and an air pipe to a MAF you would be done other than the trip to the tuner.
A second alternative would be to use one of Ford's own OEM or an aftermarket copy EFI manifold and plenum for your style heads. Alternatively, if you wanted to be really creative you could fabricate a simple runner per port with a plenum and forward facing throttle body reminiscent of something like this:
The individual runners would crisscross each other under the plenum, entering the plenum on the opposite side. With an injector per port this would be an exceptional system.
The thought of the fabrication process is much more daunting than the actual event. The manifold runners turn out to be off the shelf tubing and the plenum can be fabled from an ovaled tube (off the shelf again) that the runners get welded into. Weld in injector bosses are off the shelf items. Use a thick intake flange for the heads and you are pretty much done. You need to have a two bolt mounting pad for an idle air control motor which you can hide on the underside of the plenum and a vacuum nipple for vacuum accessories (power brakes?) and you are basically done.
The finished manifold and EFI would have stunningly good street manners and real world performance. If you want bling polish the aluminum or if you want a more conservative look do a wrinkle finish powder coat.
Best part is you could do this while you drive around on your carbureted engine, building the system at your leisure spreading the effort and expense over time and making it a fun project instead of a painful job.
Ed