I'm in the process of getting a new pump for my 74 K5, with 350. Every place I go to, the pump the hand me isn't the same as the one I took out. Which leads me to believe that a previous owner swapped one in from another application. Mine has a pulley that is pressed on the pump. The ones the stores keep handing me have a setup for the pulley to bolt on with a key on the shaft. Can you guys all tell me the years of your rig and if you have the bolt on or press on power steering pump pulleys. I'm going to the boneyard tomorrow to try and get the right pulley and/or bracketry. Thanks in advance.