FERM, where are the model/serial #'s on these things?
Do you have pictures of them and the freeze plug looking thing with the numbers stamped in them?
hard, just as soon as we can get you to post pictures of the motors serial/model #, we can tell you what year it is.
Quite possibly this is it.
hard, either take a picture of the numbers on this shiney round plug or write them down and give them to us (if that is the serial # plug).