Going back to Gary's original question...
I think this is eBay number 390391248545 which is presently still active. Interestingly, since I first looked at this posting several days ago, the engine pictures have been removed. Hmmmm....

Assuming that it
is a two owner car, it still could have shed its dual quad set-up a long time ago for any number of reasons. I suspect that many Ford dealerships had difficulty doing work on dual quad and supercharger equipped cars. Locally, I know of one 'F' 'Bird that a Ford dealership talked the former owner into converting to single quad because of 'problems that were too expensive to fix'. They did a thorough job of removing ALL the 'F' components in repairing the car for him! Too, if the dual quad set-up was not tuned properly, or was pushed when cold, it may have coughed resulting in a fire that caused damage to the carbs. Maybe somebody needed money along the way and sold the set-up because, 'it was a pain to keep running right anyway'.
Too, it may not be an 'E' car... that is the data plate and the frame numbers may not be the same. Right or wrong, 'E' 'Birds bring more than 'D's or 'C's. Whether it be a true 'E' or not, I suspect that the air cleaner housing is either '56 PowerPak or a reproduction of one. One reproduction of this style that I had an opportunity to inspect was a high quality stamped unit with an
oval air filter element.
IF I owned an 'E' car and it was missing components, I believe that it would likely be well worth while to equip it properly for sale. While it might cost several thousand dollars today for original or reproduction parts to properly equip an 'E' car, everything else being the same, the 'E' will command a significantly higher price at sale than a 'C' or 'D' 'Bird.
Regarding data plate swaps, this same type of thing has been going on with Muscle Car clones . . .
NoShortcuts
a.k.a. Charlie Brown
near Syracuse, New York