I have a 1975 Chrysler 45HP. The motor sat for about 2 years before I recently bought it. I believe that I need to replace the water pump. Assuming that everything else is okay, is the impeller and the lower unit seal kit the only thing I need? Is there anything else I should check/replace since I have to remove the lower unit anyway? Who would be a good source for these parts? <br /><br />Thanks