I guess I should clarify, my collection is all motors of 1956 through 1963 vintage. While yours and mine were all made by Gale, significant changes exist. OK, having said that, the carburetors are all the same. For the benefit of others reading this, what you are calling a choke, is actually the high speed mixture adjustment, which also functions as a primer for starting. Since it functions as a primer, ir receives a lot of turning back and forth and regular packings do not hold up very well. For that reason, they used a special packing made of leather. Lots of other substitutes have been used, including Teflon tape, cotton string, rubber o-rings, etc. As for me, what I do is make my own leather packing from an old leather belt. Works for me.
As for the leakage at the studs, I don’t know what to say. Those are one of the significant changes I mentioned. My motors do not have those studs. But mine do all have crankcase puddle drains, which drip. I just wonder what they did for puddle drains on yours–if anything. I have worked on your style motors, but a long time ago.
EDIT: Forget what I just said about puddle drains. I was thinking about the 5hp motors. My 3’s do not have exposed puddle drains. Sorry about the mis-info.
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