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You definately want to run coolant thru the manifold whether in southern ca. or Alaska
You are 100% correct, always run coolant. If you think the manifold is too hot, try a 1/4" or 5/16" restrictor.
unfortunately fuel economy is not it's strong suit
Eventually, you should be able to get nearly the same economy as twin SU's, but as you say, it takes a lot of playing with the jetting.
Can you tell us what jetting you have & a little about your motor please?
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Three 164's, Two 144's, One 142 & a partridge in a pear tree.
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