Actually the intermediate circuit was derived from metering blocks used in a Chrysler emission carb, the application was to use them on individual runner intakes where pulsing below the throttle bore is high. 4 and 6 cylinder engines can suffer from this, it disrupts booster signal at lower RPM's. Dominators running methanol can benefit as well with the right 3 circuit blocks (not factory blocks with the idle tube in the mainwell), not so much because of booster signal issues but as a supplement to the main fuel as passage sizes are on the border to pass enough methanol. For a V8 on gas it's rare an intermediate circuit is needed at all if you calibrate the carb correctly. Plenum intakes dampen pulses so there is no hole to fill when tuned correctly. I have run up to a 2.400 throttle blade billet carb with no issues running the intermediate circuit plugged. That carb flows over 1800 CFM...