These after market units cool as well if not better than the 45 year old OEM units. My reason for the upgrade is this. I need a new compressor, evaporator, receiver dryer, and condenser. In addition to a new blower motor. I am also looking forward to electronic controls and no more vacume leaks. As far as originality I find this to be as valuable as rack and pinion steering .
If you are considering this upgrade look at both products Vintage and Classic. My choice is Classic for a cole of reasons. There kits fit and there plenium units are not factory sealed. So if down the road you need a new heater core just buy one and replace it. The other unit is factory sealed and must be sent back as a unit,