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In the winter the gasoline stays pretty cold, even on a long trip because the gas tank is hanging right down in the open and the carburetor tends to stay cold because of the cold fuel in it and the veturi effect of air passing through it causes it to cool, that is why it often has a small amount of engine coolant running near it, to keep it warm once the engine warms up, so it doesn't ice up, but that takes a while to.
A sure fire way to get a cold engine to fire up is to pull the spark plugs and heat them up, once those droplets of gasoline hit the warm spark plugs in the combustion chamber then it turns to vapor and will burn, the choke dumps in more gasoline because not all of it vaporizes, when an engine block is cold the compression is also lower due to larger ring gap and so on.
I'm not saying that warm fuel will not work, but it's going to be fussy, keep it warm for to long or keep it to warm and you can cook it down to varnish that will not burn, it just seems like a whole block heater is going to do a better job and make the car run better from the start.
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