I converted to R134 when i re-installed the Ac in 464/1000. I sprayed out all the lines with brake cleaner, replaced all the o-rings, coated the o-rings in mineral oil before assembly, and re-used everything else, including the dryer. The only differences between my system now and when it left the factory are:
a. R134 and fitting adapters on that one hardline
b. R134 in the system
c. I *might* be running a 2G DSM compressor. (Not sure.)
464/1000 pumps out 45*F air when it's 118*F outside here in Phoenix. #lifesaver