Sounds and looks great! The carbs tied together does not seem to be hurting throttle response off idle. That is a good sign. Mileage will take a hit yes.
Could you share your pcv plumbing? I can't see where all the hoses go to. I have a Wagner on my 483 and I used as it's source of vacuum the rear of the intake. My idle vacuum is only 6.5 hg. As such I don't have two circuits set up, only the cruise circuit. Thanks, JB.
Every second counts