Not sure if any of you plan on re-installing your radios in the older cars, but I've found an interesting company. They will rebuild your classic radio using modern hardware on the internals.
http://www.antiqueautomobileradio.com/
I've not done this yet, but will do with a Blaupunkt that came out of my '60 Sprint. I plan on setting it up as a 4 speaker system... I know, Alfas are nice to hear, but sometimes, it's also nice to hear other things during a long drive.
As I understand it, it's about $400 to do this work, which is about the cost of a very good modern system. Although, it's almost impossible to find a really good 2 post system anymore.
I'll give it a shot, but won't know anything for a few months- it takes 6-8 weeks for the rebuild, and I probably won't be in a position to re-install it for another month beyond that.
The hard part will be to find places in a Sprint for 4 speakers so that you don't see them, but can hear them. Any suggestions?
Eric