Retro Fit Factory A/C into Original non-A/C 1968 Barracuda Convertible

I hope you realize that the location of the heater motor changes on a factory AC car.
I did not, which is the exact reason I'm inquiring, as this is the first project car I've taken on and know no nuances. So to your knowledge, is that some remounting/bracket work and/or is it more involved? Would an aftermarket A/C be a better route?