Car Audio in Early-A bodies?

This is the path I'm taking for the car I'm working on now.
http://www.forabodiesonly.com/mopar/showthread.php?t=152662

The front speaker is a 6x9 with a special adapter bracket. You just need to stand on your head under the dash to access it! Running wires is easy in these old cars just pull those aluminum strips along the sill and you can run tehm next to the factory wiring.

This link might giive you some ideas for speakers. http://www.forabodiesonly.com/mopar/showthread.php?t=129759 the first page has a photo of your setup modified for twin speakers.