Kuehl, thanks for the lengthy response.
Funnily enough the reason I want to keep stock is I was thinking of entering the car into concours as some stage for fun. Good idea about asig the judges about this. It is a garage queen that only gets driven the odd weekend in the summer with me wearing shorts. In Atlanta I prefer this time of the year and the fall to drive it most anyway. In terms of expectations I drove my other 3.2 with no AC in Atlanta and it was OK as long as it was parked in the garage or shade between trips.
I will probably give you a ring at some stage and figure out a basic upgrade to without deviating too much from stock. As stated I am not expecting fantastic A/C just OK will do