carb makes whistling noise

Have you used a stethoscope or short piece of rubber hose with one end held to your ear and the other moving around the engine bay while the car is running to hear where the whistling sound is loudest/coming from? Is it coming from the base of the carb? Tried tightening down the carb mounting nuts? Is there a gasket paper or spacer) between the intake manifold and the carb? If there’s a spacer, perhaps the metal grommets in the spacer are higher than the actual spacer material so it’s leaking around that? If you only hear it once the car has run for a little bit, when you turn it off and restart it again (car is still hot or warm you restart it) is the whistling sound there immediately?