Carb-hole info from smart 84-87 guys.

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You can see if you look for the raised areas i.e in pic F below #6, these are passages. Some go straight through to an exit hole while others may go somewhere indirectly and have a peened in ball plugging the hole where the passage was drilled i.e. below #4 in pic O. Follow the passages to see where they go so you know if air or carb spray is getting where it needs to go.

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Since you already have them apart, why don't you boil them? That's what the experts say to do.

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Try blowing water through them using a water pic. It will give you a good indication of where they go or if they may still be plugged with gunk.