This is the truck accessories on a 5.3L. The AC is low on the passenger side- I made a knock-off of the mount that Vintage Air sells for the Sanden compressor (I did have to grind one of the ears off the Sanden compressor to get it to clear the frame rail, but it was the bigger Sanden compressor) I think the compressor mount they use comes from Alan Grove.
This engine is back a little further into the firewall than most and it's a GMC too, which gives a little more distance to the radiator from the front of the motor.