Recently had engine rebuilt and carburetors rebushed. 76B with 2 HS4's. This setup necessitates a low profile air cleaner since anything over about an in inch in height won't fit on rear carburetor due to brake unit. Carbs presently have AAA needles. Is this possibly running too rich (getting poor gas mileage - about 20 mpg - Should I maybe go to AAE). Plugs look great, however. Nice tan color running 93 octane. What would anyone recommend for air cleaners. As I said, presently using cleaners about 1" high with foam that has been cut as filter element.