SJ,
Mike,you would probably have to add a fuel pump then too I suppose. After a night flight from CT - OH with a lot of carb ice, I wish it were injected!
sj
Hey, leave the carb heat on, or at least partially on, so that intake temperature is well out of the freezing range. Your not going to ingest anything at any reasonable altitude, so there shouldn't be any fear of harming the engine.
Most of these carbureted big bore Continental engines like a little "heat" anyway, helps with the fuel vaporization, giving you better fuel distribution, i.e. they usually run smoother. Yes, adding carb heat does enrichen the mixture, so set the carb temperature you want first, then lean like you would normally, ROP or LOP, doesn't matter. A lot of people have a lot of success around 50 df, mine likes it a little warmer, around 64 degrees.
Get a carb temperature gauge, if you don't already have one, and try it. And if you have a engine monitor, put it in "normalize" mode ( it's more sensitive and reacts more quickly) while you try it and you can watch the EGT's and CHT's smooth out, left side of the engine with right side, while varying the amount of carb heat to find your ideal temperature for the best fuel distribution. Then, it's just a matter of setting the carb heat to that temperature again while in cruise and you leave it there then the ice can't form.
I just leave it on, if carb ice is a concern, all the way to pulling off the runway, keeps it simple.