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The crankcase on the early to mid 60s are prone to leaking. I have been through at least 7 or so 60-65 Merc 200s and they all leaked on fuel pump side where crankcase halves meet. There is a fairly long span between bolts in that area which mercury eventually changed. There is a blank (not drilled) boss on the early motors that I have thought about drilling and tapping then using.
As far as the rope staying with mag: Yes there is a little notch in crown for knot, DONT use it! The rope knot doesn’t seem to release well with this design. I had one start and swing the big wooden handle around like a medieval ball and chain, at least it felt that way. Don’t ask how I know all this. Probably others out there who can also say they have had a beat down by one of these.