I'm Looking for factory air for my 1966 k10

[rbar]

I have the factory set up from another vehicle. I plan to buy the Vintage air set up but use the factory vents above the radio and use Vintage air's knobs that look just like the originals. Vintage air told me that I could make the old unit work, but I would have to have some kind of conversion set up and it would run even less efficient than it did new. Hopefully that's good advice and not just leaning me towards buying their system. I do I like the electric controls and adjustability of a new unit and making the dash look original.