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I'd say very likely. As likely as my auto body being mated to a manual frame and then installing a restamped M-20 and claiming it's the original transmission...
There was an owner here asking a similar question about a year ago, except he was trying to push acceptance in NCRS Flight Judging as his focus.
My books show a 9204 being used on auto trans cars, not a 9214 but it is known that the 9214 was used on 396 trucks and possibly Camaros of the same time period. If it's true that 9214s were not used on Corvettes, how did one end up at the St. Louis plant?
If they were used on Corvettes (meaning my books are wrong) usually the big difference between a manual carb and auto carb is linkage for the kickdown mechanism.
If that's not an issue, then somebody may have just grabbed the wrong piece in the engine dressing area and it slipped through the system. Hard to prove one way or the other.