440 /super charger add on ?

Not real sure where to go from here , try to take the solid linkage off from the front carb and crank it up it only takes a little to open up one of the carb blades and cause high idle . I have a little of experience with holly carbs and I try to stay from the ones you have , no idea how to adjust or work on em .
what about the 850 to 900 idle I have now in gear..seems if any lower it will die in gear...and your thoughts on timing...that's for your info