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A '91 175 Merc should be self draining in the upright position. If it's been parked since Sept, it is most likely dry already. It wouldn't hurt to trim it all the way down to make sure though.
Of course, if I have an engine that's going to be sitting for more then a month or so, I always fog it. You'd have to get a muff system to do that now though, but then again they aren't expensive.
Do you change the lower gear oil often? That wouldn't hurt either, and if you discover a leak now it will be easier to track down the appropriate gasket or whatever fix is needed. Not something you want to be doing Friday night before you hit the water Saturday morning.
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