Swapping my 318 for a 78 motorhome 440. Been doing some research and there seems to be LOTS of different options for brackets. My vehicle had a complete working factory AC setup, I would like to retain what I can. Can anyone point me to what I need to get the AC and other accessories mounted? Photos or diagrams? I went through the factory service manuals looking for part numbers but its not clear what I need as there appear to be several different setups.