IMo, it's got a lot more to do with a correctly fucntioning cold environment starting system than any other reason. The crossover function has nothing to do with engine operating temp. It lets the choke pull off faster and apparently there wasn't enough power lost through heating the plenum base to make it not a good idea for the factory. But once an engine is no longer stock I see no reason for it. You can simply re-set the choke if you stay with a factory one, or remove it entirely with little fanfare. JMO anyway. I drove my 6bbl car with no choke all winter for a couple years. Freezing cold starts meant I had to feather the gas for about 10 seconds. This car had 7" of idle vacuum and was not really close to stock.
Well, art is art, isn't it? Still, on the other hand, water is water! And east is east and west is west and if you take cranberries and stew them like applesauce they taste much more like prunes than rhubarb does. Now, uh... Now you tell me what you know.
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