Was there an FM available in 300's in 64??? I believe FM was only available in Imperial. We got the FIRST FM in our '65 Dodge Coronet and it cost damn near 1/4 the car. I have the window sticker buried in my files---it was something like $700 for radio package and $2,500 for car!! FM then meant tuning capacitors, static collectors and eliminators and all kinds of goodies on car, even a different antenna. If it was an option in '64 300, the radios are certainly rarer than the cars. If your find one, it would be a sin to gut it and "modernize". Better you just carry a "boom" box. The early FM units are kinda like factory 4 speeds, but rarer. L.Andrew Jugle, Elmhurst,IL