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Loud suction/vacuum noise coming from the carb

OrangeTA

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Mar 13, 2025
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South Carolina
In short I just turned 16 and have no clue what I’m doing. So my current problem is a loud sucking or maybe a vacuum sound from the carb. Accompanying that the carb will not idle at all no matter how correctly or incorrectly I tune it. If it does idle it’s barely and for only a short period of time hovering around 500~rpm. I have a 403 olds engine with a 600cfm edlebrock carb that I have replaced ALL the gaskets on the only thing left from when it started making the noise is the conversion plate itself.

For the carb yes Im aware it has the fuel mix screws dialed far back but please tell me anything I have wrong or ideas on what the problem is
 

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