So as the title says has anyone added factory AC to a 1st gen that did not come equipped with AC? Can I save a buck this way or should I save my pennies and get a vintage air unit?

I was driving in 110 degree heat last weekend, and now the wife told me I have to get a/c in the rig if we are going to do anymore trips like that (up to the mountains, through Sacramento). No way am I going to argue with her if she is telling me to put some money into the rig.
Question to add to the conversation, any benefit of Vintage Air over Classic Auto Air, or Old Air Products.
Fear, were you picking VA because it's the first one that comes to mind?
Thanks,
Jacob