What Radio to use
Not sure what's available near you, but we have a company here that will rebuild the guts of your existing stock AM radio so that you can pick up FM stereo. They can also install a pig-tail that you can hook up either a satellite receiver or MP3 player into.
We have special "Collector's Insurance" here, for cars of a certain age that are in "stock" condition. This option is covered under this policy, so it is "original".
I can get you the info, if you would like.
Hope this helps.
Mark