Hi,
Yes, adding A/C to a non A/C car is quite a project. I'm looking at doing it with my non A/C 86 Plymouth Reliant. I've been working on car A/C systems for over 30 years so I have all the tools and equipment required. I haven't decided how i'm going to do it yet, a full factory R12 system or something like the ACkits approach. I may decide to do a factory under the hood R12 approach with an add on evaporator system under the dash, that's kind of my current thinking. I do my own A/C service work on all my vehicles and have been using Arizona Mobile Air (ACkits.com)the past few years when I need parts. Their prices are about the same or sometimes a little better than local suppliers. but, the quality level of their parts especially compressors is much higher. Also, they have been very helpful when looking for an oddball part the local guys just shake their heads at.
Good luck with your car and let us know how you make out. It sounds like you have found a very nice car and if you intend to keep it and use it adding A/C may be worth it to you. Here in New Hampshire many cars of our k cars vintage also did not have factory air. We really don't need it up here. but, if you are planing on taking any longer trips south in the summer a non A/C car isn't much fun.