I am currently in the process of replacing the water pump on my 83 Eldorado (4.1 ltr) and everything has gone relatively smooth but I have come across a pulley below the smog pump that is blocking the two lower left bolts on the pump. I cannot figure out what tool I need to get the pulley off to finish removing the pump. It looks like it is threaded inside the pulley shaft but I tried my pulley puller and it would not line up, is there a specific puller needed for this?