A/C compressor as air compressor question

Hey A/C gurus...... I have a odd question that if someone could answer it would sure be helpful. I have a friend that is into 4x4's and off roading.
He wants to use the a/c compressors off 70's and early 80's mopars as underhood Air Compressors (using the V-twin style compressor) I have never messed with a/c let alone changing it over to a air compressor. His question is this. Are these mopar A/C systems a wet sump compressor and does it need a inline oiler on the intake?

I can get more info if needed... just thought maybe someone could answer that part of it.

thanks in advance !

-RPM