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The line to the air cleaner on top of the carb just insures clean air going into the engine from the factory stand point.
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It also helps ensure the crankcase air is warm which reduces tendency for heavy hydrocarbons to settle and build deposits in the crankcase.
Another option might be to use a spacer under the carburetor and add as many fittings as necessary. A phenolic spacer would insulate the carb slightly and could help prevent or reduce unwanted fuel vaporization. Today's fuel definitely does not perform like gasoline in the '40s and '50s.