help diagnose whining noise
Take the carb off,, and check both of the base gskts to make sure they don't leave a small gap somewhere,, or somewhere that the gskt will suck in with high vacuum,, and close at low vac.. (wot)...
Tighten the carb base-plate screws on the bottom.. then try it again..
It may also be an internal carb/gskt leak..