Nip
Here's what I do, I have a inbd like you do.
I take 2 light bulbs (60 watt or larger) (incase 1 burns out you still have 1 working) and lay them on either side of the carb on the intake and close the eng cover. This will warm the intake which will warm the block. A friend of mine bought a elect heater that isheld on to the oil pan by a magnet. He likes it and says it keeps the oil warm.
I have done the light bulb for 10 years now and have never had a problem.
Now I have a garage to keep her in so I don't worry to much anymore.
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Tis better to be quiet and thought a fool than open your mouth and prove it!!
1991 V-20 cuddy I/O 350 volvo duo prop, 1998 15ft Grumman 9.9 Johnson 
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