Old Mustang, Falcon - interchangeable parts?

What parts from an older stang are interchangeable with a 66 Falcon? I guess mainly Im looking for a steering column,box...since my 66 has the rod of death in it and a rearend. The steering Id like to get aftermarket but was wondering if anyone knew if they would match up and the rearend I would probably get from a junkyard but needed to know if it would bolt right in? Any help is appreciated!