Without actual carb numbers this is weird diagnostics. Hemi did not need holes in throttle blades. 66-67 cars where air bypass, so you had an air valve. Venturi in Hemi are different type than most AFB non hemi. If you have odd carbs you probably also have a distribution problem. Is the manifold Vanke mod? Ignition type? 68-71 carbs where emission carbs and leaned out, but still no holes required for stock car.

Even folks that use Edelbrock clones don't seem to have issues when jetted correctly.

Did the carb shop have your car when they drilled holes in carb blades? Otherwise confused why a choke swap got you a modified carb.