The other thing I noticed is the power antenna has a CB cable on it along with the radio cable.
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Like the others, can you provide a photo of the connecting cable/coax to the antenna?
I'm trying to picture in my mind this setup. The year is without question in tune with the CB craze that covered the US for many years.
Outside chance it could be part of an extra package that was part of the Hurst shifter. (?)
However, since you said it connects to the same antenna there should be a loading coil someplace in the antenna.
Something that would be about the size of your thumb but a little longer. This would be needed to correct the standing wave ratio for the CB to work correctly with out burning it out.
Send a photo of the antenna if you can and the connecting point.
I'm guessing you do not have another antenna such as the Bandit had located between the T Tops? Actually that looks good in the movie but it didn't leave much of a ground plane for the signal with all the metal missing. It would work but not as well as being placed in another location. Sorry, I'm getting off-topic. Look at the left side antenna on my Goldwing and you will see something like I'm asking about. The right antenna is for radio, left for CB radio.
PS: Where the radio dial is located looks like it may lift back for an 8 track tape to go into.
Just curious, does it have an 8 track player as well? That too would be in line with the year.