Re: Quadrajet question
Q-Jets were installed on a wide range of vehicles. Not at all uncommon for a port to be plugged from the factory or after a carb rebuilt.
If the line with the capped T is otherwise working, the T could be a PO's answer to mis-matched hose sizes or the only hose connector available at the time. Or could be for something since removed.
If the climate control is working, I would replace the T with the appropriate connector and call it good and just leave the carb port capped.
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