Carl, all I can tell you is I've been using a filter like this since 2021 for 5-6000 miles (and as far as I know that's the only type filter it has had for the previous 15 years). It does not restrict air flow in any way. The truck runs fine at all speeds with no bogging or over rich condition.
When placing the air cleaner on the carburetor of an idling engine, there is no rpm drop whatsoever.
I use this truck as an everyday hauler with loads of firewood and lots of other things. I've never experienced any problems that could be associated with poor fuel / air mixture. The only problems I've had were Chinese fuel pumps and contaminated gasoline from Sam's Club.
