HaHa George is pretty passionate about bastardizing the center divider of a dual plane intake. the cut down divider modification goes back at least to Holman Moody, they specified lowering the divider by 1". more recently Edelbrock Performer RPM & Airgap intakes feature a lowered center divider, i'm not sure how much has been removed as I have not handled any?
it's fair to say that the mod does improve top end capability, but at what cost to low end & midrange? with a manual trans you'll have less of a chance to notice what a stock auto trans car might experience in off the line /low throttle angle driveability
basically the mod creates a hybrid 1.5 plane manifold. remember that the more 'crosstalk' you have in the plenum, the larger the carb will act. instead of each side of the plenum accessing only 1/2 of the carb's rated CFM capacity each bank will be pulling from more near the total plenum & full CFM capacity