Re drain that thing, it doesn't take long and you risk a lot of $ if you don't.
I can drain my V8 Mercruiser in 15 minutes.
If your drive is down there is no water in it to freeze.
Just pull the appropriate hoses & plugs and you won't have to worry. We still get frozen nights into April. It's New Hampshire after all.
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1989 Baja Sunsport 196, Mercruiser 5.7, For Sale
1987 Formula 223 LS with 1997 350 Mag 
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