Hey,
be very very carefull if you remove the a/c compressor on that engine. There are four bolts that bolt the compressor to the engine. They are not all the same length. Small difference in length, many people have not picked up on it when reassembling. If you put one in the wrong spot it puts a hole in the side of the block perfectly lined up with the main oil feed. Oil will leak out at a massive scale and You will need a new block.
DON'T MAKE THIS MISTAKE!!!!!!!
Also don't ask me how I know this....... Been there done that.
It is very likely that it is the compressor. discharge the system and remove one of the lines. Put a clean paper towl inside the line and see if it turns grey. I suspect it will.
