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I don't know about a 70....
but on a 72,
bottom port goes to manifold vacuum
the one above that goes to the advance,
and the one above that plugs into the back of the carb next to the hot air choke tube.
There is also one on the very top of the unit next to the electrical connectors that runs to the front of the carb.
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 I'd rather have a numbers matching poker hand.
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