Thank you everyone for all of the valuble information.
I was going to say that I would be surprised to find out that my engine is not a High Output engine given that it says 5.0 LITER E.F.I. H.O. in bold and black on the air cleaner, then someone shed some light on the matter and cleared that up. (Also, where does the term CFI even come from given that ford called it E.F.I right there on my car???? The only reason I called it CFI was because that's what everyone in the forums calls it, and I didn't want to cause confusion with the EFI from 1986-current.)
I do believe I'd go the Holley Sniper route rather than trying to teach the CFI unit how to handle upgrades, but if it can be done for less money with MegaSquirt or something else and all the benefits of the Sniper, I'll do that route.
So the way I understand it, with Ford designing every part of the engine to specifically work with every other part, that would mean I cannot simply replace the intake manifold with the Edelbrock Air-Gap, install a 2bbl carb to 4 bbl manifold adapter, and place the stock CFI unit on top with the factory computer calibration without messing up the air-fuel ratio from one cylinder to another. Is that correct?
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