I went with the Old Air system initially because:
1) They use a larger front condenser
2) They have a suck though evaporator design.
BUT
After living with it for a year
The old air system uses to small of an evaporator. Couple that with the suck though designs that causes the air not to flow past the very bottom of the evaporator, makes them prone to freeze up. As the water condenses from the top it leaks down to the bottom section where it freezes because of the minimal airflow. I had to modify mine box and temp cycle switch to make it work somewhat right.
The Vintage Air uses a larger evaporator and blow though designs. This so reduces the chances of freeze up. But limits max airflow.
If I had to do it again I would get the Vintage Air set up but use the larger front condenser.
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69 SWB C/10 5-6 drop 700R4
69 Firebird Convert 455 4 spd
70 Torino GT Convert
Austin-Texas
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