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I've converted my 1990 964 and earlier my 1987 944. In both cases, I replaced the dryer, purged the system with a little R-134, and then charged it up with R-134. In both cases, the system cooled fine and maintained charge (in the 964, that's lasted 3 years now)
Dryers are cheap, bit of a PITA to get to in the 964, but not a hard job at all
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1990 C2 Cabriolet Guards Red 
'81 928 Zinnmetallic Project Car (sold)  )
'87 944na Maraschino Red Metallic (sold) )
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