383 Wont Idle with new to me 800cfm DP. Idles and runs ok with Edelbrock/AFB

harrisonm said

You may disagree with this, but I think it is time for a NEW Edelbrock 750 (+/-) Carb. I would never buy a used carb that was rebuilt unless it was built by a professional who made a living by rebuilding carbs. I realize there are a LOT of people out there who are quite good at rebuilding carbs, but for me, It is new or professionally rebuilt. That is my $0.02 worth.

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I don’t disagree. I don’t have a problem rebuilding a carb. I am more wondering if there is something specific to Holley such as the power valve that makes it not like this engine. I have a 750 DP on my 340 and runs well, however someone before me drilled small holes in the primary throttle plates. Was wondering if this is a fix for similar issue. 340 has a MOPAR 508 292 cam and runs 11.90s.