So I purchased a replacement water pump to give the cooling system a little boost but of course its never that easy. Now the pump did in fact mount perfectly to the engine but the issue was when we went to attach the pulley and fan. It seems the diameter on the pump end is significantly smaller than that of the previous one. So needless to say the pulley and fan could not be attached. The other thing is that the pumps arm is shorter than the previous. Im wondering if the old pump was for the another engine type, cant tell for sure since the engine has been rebuilt. Now the hunt is on for a fitting pulley and fan!