The modern stereo system

a couple suggestions:
I put new kickpanels made for speakers in my Dart - now the vent doors only open half way. Latest project will have the twin speakers in the original location in the dash. I've checked out others who did this and the sound coming up and projected out by the curve of the windshield is better IMHO.

Check out Retro Radio Restorations - Mom and Pop business (literally) in Pennsylvania (always at Carlisle). They take an original radio and change the internals. As long as the mechanical stuff works (push buttons, dial tuner...) the donor doesn't even have to work. You get AM/FM stereo, input for MP3, portable disc player, bluetooth connection, etc and it looks like original (after all the radio box is) so not cuttin' nothin'. If you can find a factory AM/FM radio then they use the factory AM/FM switch, otherwise they us a funky quick on and off of the knob to switch - sometimes switches itself if the radio is on and you start the car.