Hello
An other trick is to use the "step" methode. The following port is slightly larger avoiding inteerferences also the steping generates turbulence ( Grenzschicht ) on the wall and and the step will stop backflowing.
A simple way is to use shootpening to flow the ports. You will see any overstanding and the shootpening is made with airflow with likes to find the lowest resistance.
Shoootpening will not abrasive to much so you have to start with the basework manually.
Just want to mention that carbs don´t like to much polished ports. FI loves super smoth surfaces.
Grüsse
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