Could it be related to the PCV valve? It might cause a whistling sound on the passenger side valve cover. That's where mine is connected. If it didn't shut completely off at idle, it might whistle a little. Take it out and squirt some carb cleaner through it and see if that helps. A new one is only a few bucks. Just a thought.
Rev
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'66 Coupe, 306, 300 HP, C-4, 13.97 e.t., 100.3 mph
1/4 mi.
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