Olds455 ... Whoa, yeah - just use one of those, maybe!!
My thought was a pipe with another movable pipe on the end of it hinged on a pin through the middle. The hinged pipe could be moved via a cable, like a "choke cable", to swing it closer to the manifold for more heat, or farther away for less heat. The pipe's open end would probably be cut on an angle too, so it could snuggle-up closer to the manifold.
I realize homemade moving parts in an engine compartment are asking for trouble though,, so the conventional warm air intake from an older car might just be the ticket!!!
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