Your fuel system sounds fine.... you might have to
go with a larger N/S on the carb(maybe)... on the O2..
they work fine ONCE you get your WOT figured out..
there isnt any magic number you should shoot for..
but once you find your best MPH then you can take a
O2 reading so you can get back to that number easy if
you change the jetting around... remember that MPH is
the HP... ET is chassis