I'm getting ready to swap a great running chevette 1.6 4 banger into my wifes 57 nash metro this summer. the car is to be a weekend cruiser not a tire frier so I think it will get down the road just fine. I want to put air cond. in it at some point and bought a very cool looking old underdash unit that I hope to use. does anyone know what compressor, if any would be the most efficient RE. power drain on the engine? I had planned on a v-6 for this car but the 4 cyl. with automatic trans. presented itself and I just don't want it to be undrivably slow with the air on.