I have a '75 Dart on the road with a factory AM-only radio. Unfortunately, the fuse in the fusebox is good, but the radio does nothing when turned on. It appears that all of the wires are in place, including to the one dash speaker, but the only think I can see it do when I turn it on is slightly dim the dome light when switched on - absolutely no audio.
I bet if it were working, being designed solely for AM transmission, it would pick up stations quite well. It's solid state... I might have to tear into it at some point. The preset station buttons still seem to work as intended.