Don't be surprised if that adapter ends up getting a thick coating of ice if you're in humid conditions. I'd suggest fabricating a square heat box from sheet metal that duplicates the shape of the top of the intake manifold. The fuel evaporating below the throttle plates will drop the temperature pretty dramatically. A friend who ran a liquid Propane injection system many years ago ended up with a 2" thick block of ice around his throttle body after a 25 mile drive, and that was in central California with very low humidity. It jammed his gas pedal linkage at about half throttle.
Jerry


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