Ignition or Carb problem

I found the problem. The fuel level was set too high on the rebuilt carbs. Adjusted the carbs and now my plugs are good, no black soot on the landing gear or the belly of the airplane, and it does not run rough when pulling the rpm’s back for landing. I also found the vent lines were run all the way to the bottom of the cowling. I cut those down to about 4” and tucked them behind the bowl clip. I finally can enjoy fly the airplane.