Whistling sound coming from the carb, right at tip-in ('71 318, Holley 2 Bbl).

I have had whistling noises from different types of carbs on different engines. While a gasket leak could cause it, there no leaks. I believe the whistle is caused by the air speed & shape of the t/blades & carb body setting up a whistle. Change one factor & the whistle goes way. Like blowing air across a Coke bottle.