Lots of good info in this thread, I should have searched a bit harder initially.
From seventy2plus2: Jun 28, 2015
Easily a few hundred dollars. Working condition? etc. From my Delco Radio Service Manual, for your 1968 B-body, Model # 7303302 is the AM/FM mono version, 7303362 is the AM/FM stereo version. That's only helpful if the white paper sticker is still on the radio. There are differences between model years, and body types so be careful. The differences have to do with shaft length and heat sink location.