Hi all
Whilst restoring some panels the other day I remembered this thread. Here is a difference that most would not be aware of, namely the gauges and speedometer holding screws. As can be seen from the attached image there are ordinary headed and round headed screws. The ordinary ones hold in the gauges with the longer being Ford with the shorter being Chevrolet. The same with the round headed ones that hold in the speedometers, the longer being Ford with the shorter being Chevrolet. Although not being much difference in length, just imagine the savings in metal Chevrolet made when you translate the difference over millions of screws.
Bob