I've got a '72 D100 360 with the factory AC. It was a 2bbl truck but someone added a quadrajet intake/carb with later small thermostat. I ended up putting a Weiand Action Plus intake which actually has the raised bosses for the 2 support brackets but there is a bolt that runs through the compressor & the nut on the backside is resting on the thermostat housing. Not sure if it will end up making the housing crack but it will make thermostat changes a little more labor intensive. By chance anyone ran into this?