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Tom Langdon recommends piping heated coolant through the intakes heat chamber and will do his best to educate you to it's benefit over exhaust heat. The main drawback being the complexity over exhaust heat. He sells a kit for it if interested.
I opted to keep mine exhaust heated but have yet to run it on the road. all my tests are on a 235 on a run stand.
Another drawback of the coolant/water heate-plate is: if you get a leak/break, then your cooling system is affected.
Also, Fenton intakes do not "flow" coolant throughout the intake, but Offenhauser and Clifford intakes do "flow" coolant from one side to the other of the intake (with the correct block-off/tube plate, that has a seal across the median/divider).
