Is it coming from the vacuum modulator on the transmission? If it has a steel line, chances are that is what it is. Look at the transmission and locate the module. See if it attaches to the steel line. If I recall, it will be mounted near where the transmission dipstick tube is mounted. If that, is it, it simply gets engine vacuum.
If the vehicle has a carb (I don't think it does, but don't recall asking), it will mount to the bottom of the carb at a vacuum port.
Let me know. See pic below.
Joe
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Wednesday, September 29th, 2021 AT 9:08 PM