Just cut the deviders back and give a nice rolled end as mentioned.With the dividers In place as cast will cause the wet fuel from the carb to be directed to the four corner cylinders.Let the fuel drop and and the air entrain with the fuel filling the plemum with atomized mixture.Leave ruff sanded surfaces at the runners and floor to help this occurr.
There are a few customers that have our modified manifolds,maybe one will post a picture.