Good day to everyone, we have a new to us of 6 months 1996 320 voyager with twin 350 crusaders that I am replacing the impellers on and there are no numbers of any kind on the pump housing what so ever, the only markings on the pump housing is the manufacture, "Sherwood", I found a supplier for the impellers but I when I ask for the cams they want to know which Sherwood pump I have, there are 3 pumps in that configuration that look alike but the cams are different according to the supplier. would greatly appreciate any help on figuring which cam I need to order. The boat is an hour away from me so I don't have the engine numbers at this time but I do have a pump in front of me if that would help.