Air Gap plenum

I do not know how much the new intake divider is cut down, I do have an old ld340 intake cut down about 5/8" and run a 1/4" gasket. this is old info on dual plane intakes. cutting down the divider gives a little more top end, slightly less low end-like approaching a single plane intake. so some cut off 1/2", some folks go more and cut down leaving only a 1/2", not rocket surgery