AN 10 out of the gas tank to a regulator to AN 8 to carbs .OR AN 8 out of the tank to a regulator to AN 6 .or two AN 8 out of the tank going in to a Y fuel block to AN 10 then to a regulator out to AN8 by the carbs this is the way we did it with the old holley blue pumps but with the bigger pumps you can get i would just go to AN 10 .for a drag car bigger line will not hurt with a good pump . AN 6 is to small out of the fuel tank