SOLVED! 318 2500-3000 rpm idling issue. Don't think its a regular vacuum leak. Swapped 2 intakes, 2 carbs ,and 6 different gaskets still no luck.

PlymouthPontiacEnthusiast said
Brawler BR-67255 Brawler 4150 Diecast Carburetor https://www.holley.com/products/fuel_systems/carburetors/street/parts/BR-67255

This is my exact carb I got it as an open box return from Holly directly.

gentlemen, i believe i have identified the problem