If you plug the air bleeds, you will be richening it up more. If you want to lean it with the air bleeds, drill them out larger......BUT if you do, do it in VERY small increments, since once metal's gone it's gone.
What i,m afraid of is jetting with a Pair of .067s in front that i may have to pull some air out to compensate or its gonna be too lean. Trying to balance it out some. Kinda big carb for small jets.