ALOT of people who drive/ drove those cars alot got rid of the 3x2 setup... there hard to tune, and just a PITA for a car you want to drive and enjoy. we had a few customers swap there original carbs for a single 4bbl...
not to say thats what happened here, but that is one reason one might take it off.
either way, i'm sticking to its a NOM car, its just wierd, the engine spec plate, the hood is wrong, ect. not that it matters i just like picking corvettes apart becasue i dealt with the most anal, stuck up people ever when i worked for corvettes LTD, so its my way of getting back