IFR and Air Bleed sizes?

More Holley tuning questions. I need to procure some tuning parts to cure a couple minor issues with my Proform 650 DP. Specifically, I need some idle feed restrictors and assortment of air bleeds. Is there an all-in-one kit you folks can recommend, or is better to buy the blanks and drill my own?

I do have a complete set of pin drill bits and a pin vise, so drilling isn't a problem. Does someone sell the proper blanks, or is best to go to mcmaster-carr or somewhere similar to obtain the blanks. Lastly, what sizes will I need? I'm assuming 6-32 for the IFRs and 10-32 for the ABs. But what length??

Thanks!