Love Merc. stuff,, No. 6 drive is the $hit.
Tried my hand for a stint as a tech. in a Merc/Glastron dealership, back in the mid 90's.
Got a 1965 Kiekhaefer/Merc 65 out board running for a Guy this summer, & also a 78' Merc. 850, for him.
Rebuilt the mag. & carbs on the 65, & made new wiring ect. ect.
The 850, did carbs,, module,, wiring,,, & stator work,,ect. ect.
Those both sound wick'd on the cups now !!