Looks like I got here too late to suggest a possible cheap water pump rebuild option for the SC. About 7 years ago my 1943 Case SC's water pump started leaking. I ended up taking it to an O'Riley's auto parts store which had checked with their supplier about doing a custom rebuild fro this pump. They sent my leaking pump off and it came back with new bearings and a new seal and a lifetime warranty- all for only about $65.
The only down side was that it took them about 6-8 weeks to rebuild it and send it back- I was getting pretty nervous that they lost it because they said that it would be done and back in my hands in 3-4 weeks.