I got a rebuild kit for my 1950 216 from Chevy Duty, I think.
The problem is that the casting had some pitting in the area where the seal rides, which caused leaking through the weep hole. This is in spite of smoothing the surface of the casting as much as I could.
Anyway I pulled it off yesterday and ordered a rebuilt pump from CarQuest for $40.
By the way, I ruined one casting by pressing the wrong way. You press everything out from the impeller side, not from the shaft side.