I'm no help, but, great car! Amazing how some of these have really come out of the woodwork in the last few years.
I seem to recall reading that at some point Mopar made a change in the wiring and it might have involved going from using body ground for the speakers to using separate wires. I think other than that you could mount a much newer Chrysler radio without much hassle. What you have is a lot more interesting, though.
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Bryan
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