Tuning a Proform/Holley carb, what parts and tools?

Start by varifying that what proform says is in the carb actually is in the car. Last proform 750 I bought had a set of air bleeds two sizes smaller then what was supposed to be in it. Once fine tuned that carb was awesome.
Good point joe, I was also wondering if this was a used carb possibly tuned different than stock.