The only throttle bodies that I haven't heard whistling problems with are the Accufab pieces. If you hunt around online I'm sure you can find a tech article explaining how to smooth the edges/drill a hole to stop the whistling. I think there is a recent post similar to this one explaining hoe to fix it. godd luck.
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-1993 Mustang, 900rwhp 03-04 cobra based 4v swap, full Griggs setup, project underway
-1994 Ranger w/ 427cid windsor (daily beater)
check it out!
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