Once in a while serpentine belts seem like a good idea and then I recover and forget about it! ; ) I see Pace has reverse rotation pumps for small and big blocks. Not even going to venture as to what works with what. http://www.paceparts.com/index.asp?PageAction=VIEWPROD&ProdID=23719
I wonder if a rebuilder could rebuild an original pump with the other impeller? (if that's all that's different) Think you have a problem? Try to figure out how you're going to get the serpentine grooves onto your six cylinder balancer! (which has the pulley grooves cut into it) Pete Geurds Douglassville, PA

