What size carb ?

Yes, my fuel system is stock with 5\16 pickup, all the 90's in the fuel line and a stock carter mech. pump. Stock 5\16 to the carb and no fuel regulator. Weren't the 340 cars all 5\16 fuel systems? I wonder what point they would run out of fuel in a dragrace situation? I had a 69 roadrunner with a healty 383 that started to run out of fuel at topend when it was going 12.90's. I would think my stock system can keep up with a smaller motor. Bob