I guess Holley just uses what they have

No one set-up is the same from one car to another, this is why we have to tune them!
Roo might be right the pink is the deal! My opinion is a carb is an imperfect device, never right in all circumstances. So figure out where you want the car to run the best and tune for that!

A side note: If the car is rich out of the hole, then lean(in your case my opinion).
If you then have a high rpm stumble, like a highway thing, then couid be it's to lean, not enough pump duration, so swap in the pink.

Let us know.