Short and sweet - will a chugger SS center inlet head work on a march 815? I don't know much about either pump, and have been crawling forums. I know it will fit an 809, not sure if it fits an 815. My design plans are for a center inlet pump, and I recently got a heck of a deal on a march 815 inline . I'm just wondering if the chugger SS head will work on this pump motor. If so, will the 815 impeller fit, or do I need a different one (and would this modify the 815 flow)?