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The black tube coming from the carburetor connects to the exhaust manifold as a source of fresh air. The fresh air goes into the RH exhaust manifold and comes out. A second tube leads to the threaded fitting on the carburetor below the secondary vacuum diaphragm, just to the rear of the black plastic cap covering the choke bimetallic spring.

All of this is shown in excruciating detail in your copy of the factory shop manual.
 
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