... and you don't necessarily even need the plastic whistle. I use the little black Holley "Metering Body Vent Baffle" that you can see here in black. Part number 85-626. It works surprisingly well. It fits on the two little metering block prongs in between the bowl gasket and the metering block. It's a slip on fit, no installation other than pulling your bowl. Cost is less than three dollars.
