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Loud Screech when Revving


Onion

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I was performing a float level adjustment on my Holley 390 2.4 today. After having adjusted the idle mixture screws and the float, I gave the car a rev to see if there's any stumbling or hesitation. I give it a fraction of a second of 3/4 throttle and I hear a LOUD screech sound. I do it a second time hoping to identify where it came from, but I wasn't able to tell. It was around 3000-4000 rpm, I had about 20 psi of oil pressure, and the engine was around 130 degrees. 

 

Any ideas? This is my daily driver, so I'm pretty worried.

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