I have the same motor in my 51 1 Ton. I got my replacement water pump from CarQuest. I had to grind some little divots in the hub to make room for the fan rivets. I rebuilt my motor last year and bored it out .040. I like my 216 and enjoy driving with it.
If you do replace the head gasket, you will have to get one for a 1950 to 52 235. There are no listings for this Canadian model of 216.