This is how GMC mounted a compressor on a 302 in 1955. It is on the passenger side of the vehicle, water cooled, pressure oiled and driven by a 7/8" belt. There is a 2 groove pulley on the crank. A separate 7/8" belt drives the fan and Generator.

https://picasaweb.google.com/crenwe...v1sRgCJ_v4ZmRq6WanAE#5570714083849584722