Hi Pud, sounds like someone has let you down, they need a kick in the behind, if you had been in the air I could be talking about you rather than to you.
The bing carbie is used on a lot of different motors all needing different jetting. At one time I fitted an intake silencer on my 582 which required changes. Did both your carbies come from the same motor, if not they may have been jetted differently. After my accident I removed the intake silencer because I was concerned about the smaller jet sizes and the possibility of blockage. [paranoid maybe]. The carbies are so simple you can check every detail yourself.
Buy the way have you got that motor on yet.