The fixed slide on PD's is number 2. The idle thumbwheel is between 3&4. Your numbering them the wrong way around. As you sit on the bike No.1 is the left (alternator) side.
Have you got a photo of your carbs, difficult to believe that they could be assembled the wrong way around. And clutch rattle is on all CB750's, sounds like a bag of nails. The dry sump arrangement of the engine has a good bit to do with that.