At my shop we have install 5-6 a/c systems in older cars. One was a Vintage Air. I was so unhappy with their customer support that I started using Classic Auto Air. They are great, and for $100. I do not need the agravation. Go to their site
www.classicautoair.com
and look at their instruction manual, that is on the web. You end up using the no A/c controls, get templates to use factory vents ( or theirs) and it flat gets cold!!