340clone I removed a complete AC system from a 73 Charger and installed it in a 72 Charger non factory air car some years ago. I did convert to R134A successfully. System worked well.
Look up December 1997 Mopar Muscle.
I removed the EPR valve and spring which is located behind the suction fitting and replaced it with an electrical cycle.
I pretty much followed the instruction in the Mopar Muscle article.
I did not have to replace the condenser or add an electric fan.