Thoughts On Fuel Distribution Dams (Intake Manifold)
There's a reason why carbs for oem intakes have booster tangs and that's to improve distribution. From memory one study showed a 7 point afr spread between the highest to lowest cylinders.
Here's a study where they separated wall film (fuel deposited on the walls) and the mixture that makes it to the cylinders:
"Removal of the wall film yields a significant reduction in the emission of unburned hydrocarbons and virtually eliminates cycle-to-cycle variations of pressure in the engine cylinder."
Now think about what happens when one cylinder fires at 10-1 and another fires at 17-1? How long does it take for the cylinder to recover from a lean or rich miss fire?