Ask me in a month or two. My convertible's AC is getting restored right now. It's at a shop now, and he sent the components to a place in Florida I think, to be rebuilt.
He is going to use freon after putting it back together. I asked about 134, I guess you need to change a valve, some seals and maybe the condensor.
After 20 years of owning the car, with the AC stuff all stored in a couple boxes because the previous owner didn't put it back on when he restored it, I'm looking forward to having it back where it belongs and hopefully working!