Help me decide on the AC system

[davepl]

My truck is in for final tweaking (charge the AC, align the wheels, etc). The HVAC guy is coming in special to do my truck.

When I restored it, I used all brand new pump, condenser, and dryer. I put in all new o-rings. Whatever is in or on the firewall box is factory original still.

I drained most of the oil out of the compressor before installing it but I didn't flush anything. I vacuumed the system down to get moisture out while it sat waiting. The dryer says its compatible with both R-134 and R-12 (I guess they mean the dessicant inside is compatible).

Now: can I have it charged with R-134? Or do additional changes need to be made?

The mechanic (not the HVAC guy) said that you can still get and use R-12 on old vehicles but that it is very expensive. If that's true, perhaps that's the way to go if R-134 requires changes that I haven't yet made.

Is there a short answer on which way and how to proceed from this point to getting it charged and running?

Thanks!
Dave