1959 black 270hp (9/2/69) 1981 Beige L81(10/20/80)
If I remember right you will have to remove the pulley bolts to the water pump and slip the pully off. Slip the new belt in the pulley grooves and put the pulley back on the water pump. You absolutely need the correct belt as it will be properly tensioned when the pump pulley bolts are tightened. Close will not be good enough here.