I converted my 72 to r134a. I purchased a kit that came with the new POA valve, new drier, expansion valve and o rings. I also bought the new style aluminum compressor painted black. If I remember correctly it came from Old Air Products. I had new lines made locally, the condenser checked and flushed the evaporator coil. Just got it charged a few weeks ago. No leaks and it blows cold, but it was expensive as well and will it last? Time will tell. I'd say it's personal preference and might be less hassle if you can get your hands on R12 and you're happy with the old style compressor. Mine is also stock.
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