Friends, lovers, Chevy cretins....Let's unf*ck a Six Pack

Usually the center carb is the only one with a metering block, and therefore the only one with idle mixture screws. “4 corner idle” would be a double pumper with 2 metering blocks and an idle air screw for each barrel. You have 2 barrels so 2 corner idle. Leave it the way it is and let the engine idle off the center carb.