Used one in the Anglia, worked great, less than a vintage air, great tech support. A friend is putting one in his '56 sedan but it isn't finished yet, he's had to do a little modification only because the dash is somewhat of a custom design.
Just be prepared to make your own brackets and figure out the details of the plumbing and controls on your own.
To me, the benefit of the a/c systems that are 55-57 specific is that they use the original heater controls and they supply the lenses, etc. to mark the functions. Also remember that the cost of a universal system gets really close to the car specific system once you buy their control unit. But there's a lot of variables here and a guy that thinks for himself can build some nice stuff with a universal kit.
On the other hand, that takes a lot of planning and building, even if you're able, your time may be better spent elsewhere. There is certainly no pat answer.
A forum community dedicated to 1955, 1956, and 1957 Chevy owners and enthusiasts. Come join the discussion about restoration, engine swaps, reviews, performance, modifications, classifieds, troubleshooting, maintenance, and more! Open to all models including Belair, 210, 150, Sedans, and Nomads.