Does the accelerator pump squirt as soon as the front throttle shaft moves? If not make sure it does, instant squirt is needed, especially off idle.
I've seen and fix a bunch of "stock' Holley carbs that didn't, they all needed the pump arm screw lengthen to preload the accelerator pump properly
You should have between .010 and .020 additional movement at WOT on that screw, that is why it is adjustable with the spring in it