ive got a couple myself,but from personal experience if you run a scoop turn it backwards on these carbs,they meter great without the extra,the extra just adds to the top plate opening more turning the cam more and bingo your rich
the bud bog and monster truck guys love them but at the same time they never get enough speed going to over ffed them,if you buddy that runs them on the street has a scoop tell him to try them with out it or turn it around he will love the difference