Too Much Carb?

340mopar said
It is to big, it will have to low of a signal to meter fuel correctly. One thing to remember is on a 6 barrel the outer carbs were vacuum operated so they only opened if the motor needed it.

Chuck

Exactly, and this is the important point. If the carb is too big the velocity of the air moving through it will never reach the proper level and the carb will not meter correctly. The two most common errors are too much carb and too much cam. Everything has to work together.