Rem that is defiently a pulse line for a fuel pump. Nbd really pull out the angled adapter and just put in a pipe plug make sure you have the threads good and sealed... even if the previous owner was planning on running alky that wont matter anyways as long as the new carb you have is set-up for the fuel you plan to run. Although if you thought the previous owner ran the motor on alky id pull the head and look for any signs of detination... really the only thing that would change from gas to alky would be the dome size I would atleast double check that b4 spendong the time sticking it in a frame.