Radio removal- Under Dash A/C?
I don't know how much you want to invest in a new sound system, but before you start tackling the chore of removing the ol' AM and cutting in a new stereo, you might take a look at SecretAudio at
http://www.customautosounds.com/classic/secret.html. They offer a unit you can locate under the seat, in the glove box, etc. and it lets you leave the old unit in-place for the stock look. No prying eyes will see the new system (discourages theft.)
Jerry