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Loud whistling???

My truck had a slight whistle coming from brake booster got that fixed put a block of plate on the egr valve and for some reason the carb is now whistling like a tea kettle and only gets louder when I give it gas. It's louder than the truck and it has 5 foot straight pipes. What could it be?
Carb was rebuilt mid September and truck hasn't been run much. The gaskets didn't have any obstructions or tears and they were new.
What could it be?
 

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