That's because its in the Radio and antenna section of the FSM, there is a guy on here that has one for sale I was going to get from him, but I found another one online. Its not necessary to have, but my car is a number matching restoration so I wanted to keep all the original stuff.
I looked in my other manuals ('72, '74, '77) and they all said 50 Microfarad, and '69 and older say 0.50 Microfarads. I can't say that it is a difference in frequency between AM & FM, because the noise frequency from the alternator and ignition system should be the same. But, harmonically speaking, a change in the capacitor value could be due to a better harmonic noise suppression for the FM band (0.535MHz-1.605MHz vs. 88MHz-108MHz). A change from points to electronic ignition could have had an impact too. It would have been nice to be able to ask my dad as he worked with an electronics company dealing with Ford on their electronic ignition system and noise suppression in the early '70s. I actually still have a Motorola Automotive Noise Generator I assume came from that work.
