Winterizing a 1979 Merc 115 hp OB

[colinm]

Is there anything special I need to do as far as putting up this boat for the winter?
The engine is a Mercury 1150 or 115 hp straight 6 cyl. There was a transom saver connected from the lower unit to the lower drive of the engine. I lowered the engine with the power trim and water did come out.
Are there any jackets internally where water can be trapped?
Please advise asap!
Thanks again,
Colin
Berkshires, Massachusetts