Want to add a/c to 66 Barracuda as long as the car is apart.

For my wagon, I'm adding early A factory AC including a factory AC firewall. For my 65 Barracuda I will be adding a slimline underdash unt. It's a whole lot slimmer than a knee knocker and ought to fit without interference to the console. I can take a picture of it tomorrow. The pic will be of the unit and it's gonna be quite a long time till I install it, so no pics of it installed.