aftermarket radio install? kits available?

I'm trying to hook up a MP3 player/i-Pod to a stand alone amp I got on eBay in the 66 Cuda. Will take pictures if i am happy with it. It should be small enough to hide and I want to use 2 6 x 9 Infinity speakers from a late model Chrysler. So far it sounds pretty good. That way I don't have to mess with my radio and have all my favorite music using digital memory only.