Slant 6 AC on a 440

Having moved to North Carolina recently and being intruduced to the heat and humidity I have a sudden interest in getting AC. I found a slant 6 74 duster in my area with factory AC and was wondering how hard it would be to put it in my 74 duster with a 440. My car was not a factory AC car. I'm not to worried about it looking factory. I just want it to work. Suggestions?