My car is an original slant six with A/C but all of the components were junk when I got the car in 2007. My Brother in Law and I swapped in a 360, 904 and an 8 3/4" axle. I want to add A/C using a kit from one of the popular vendors. The Vintage Air and Classic Auto Air kits appear to defeat the fresh air function of the system.
I'd appreciate some input on what drawbacks this might have. I understand that the A/C is colder this way when it just recirculates the same air. I wonder if these systems are this way to make them simpler to adapt to these cars?