I have an opportunity to purchase a factory ac/heating system that was pulled from 64 Ranchero for $150 and install it in my all stock 65 Futura (289 ci with no factory AC). Any ideas if the unit will fit, and if yes, what should I be wary of? The system was removed recently. The vehicle has been sitting for the last 8 years but it still had freon in it when it was removed. Thanks in advance for your help.