The previous owner of my 63 Sedan seems to have retrofitted the compressor to 134a. The Problem is I think compressor is bad (low suction) and I'm not sure what he did as far as upgrading any of the other components. I was considering going to a newer style compressor, since being original isn't my main concern. Has anyone had experience with a Sanden compressor, I was speaking with OLD AIR PARTS and they have kit for the compresses that comes with the mounting hardware, exp. valve, Dryer, and the o-rings for $625 shipped. Everything else seems to be in good shape.