theres not too much oil in the pump and the mw is fed from an oil line off of the block by the timing gear hump (the M pumps feed from a hole in the shaft the drives the pump). that being said there may be around a pint or less in there so put something under the car before pulling the cover. also helps to lightly coat the cover in a sealant before reinstalling i like the permatex aerobic sealant since it doesn't grab as hard as rtv but stops oil well. this will make your life easier when you pull it again in the future (you will since once you start getting a bit more power out of it it gets addictive). as for the stops move the linkage and look to see what it hits at either extreme of travel. it should be relatively easy to adjust the stops but again be careful doing so as it can lead to real issues if it binds the governor. i like to have a square of plywood or something similar that will fit over the intake on hand when firing up engines i have tinkered with the pump on just in case.

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1985 300D om617: 8mm M pump 175cc 5200rpm, holset he221w @ 30psi, large A2W ic, compounds on the way.
KD9AFT
A&P