With the early February scheduled build date, it was pretty clear it could not have been a GT. But, at this point, I would not rule it out. I have seen some weird stuff on early Metuchen GT's. Inspect the complete metal dash area and rule out the possibility that it came out of another car. Look where it would be spot welded to the unibody all around the perimeter of the piece. Any signs of drilled out spot welds or raw/ground edges might indicate some previous work.
Additionally, spend some time looking over the car and write down whatever sheet metal date stamps you see. Engine bay, trunk, etc... There are other areas that could help date the car also, which would be things like glass date codes, wiper motor ink-stamp, etc...
The longer I'm in this hobby, the more I am inclined to "never say never"!