Any place that has constant vacuum Usually on the back side at the base of the carb.
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pull the hose off the vacuum advance and some of them have a set screw inside the hole.
Any auto parts store such as Auto Zone, Advance Auto, etcetera should have the part you are looking for.
1 Locate the curb idle speed screw and the idle mixture screw; both can be found at the base of the two-barrel Holley carburetor. Turn the screws carefully with a screwdriver or allen wrench depending on which type of screw your carb uses in a counter-clockwise direction, until the screws bottom out and you feel resistance.2 Turn both screws clockwise 1 1/4 turns to use as a starting point to adjust the carburetor. Start the motor, letting it warm up for about five minutes.3 Remove the rubber vacuum hose from the vacuum port on the side of the carburetor. Attach a vacuum gauge to the vacuum port.4 Adjust the screws, moving them 1/8 of a turn at a time in a clockwise direction, alternating back and forth. Continue adjusting until both screws have readings of 600 RPMs on the vacuum gauge.5 Remove the vacuum gauge from the vacuum port on the carburetor, by hand. Attach the vacuum hose to the vacuum port.
If your EGR valve is vacuum operated, simply remove the vacuum hose from the valve.
The most typical cause of a vacuum leak is a cracked vacuum hose. The hoses get brittle with age, and cracks are common.