Here is something you need to know if you are using a late model Coyote Engine AC Compressor and an AC Kit similar to the Vintage Air. The stock Ford Coyote compressor needs to be adapted so you can us AN 10 and AN8 line fittings that comes with your kit. Here is your source for those adaptors:
www.coldhose.com, select the Ford fittings #3-92876-3-93347 you will get both low pressure and high pressure fittings allowing you to convert your manifold style compressor to one that will work with your Vintage Air kit.