Thats right the zero-point is on the line of the left of the notches but the ignition point is on another point look ADJUSTING DATA - TAUNUS / CORTINA .
These are the datas for leaded and unleaded fuel i dont know what are the dates for lpg.
If you don`t have degree marks on your engine this can help you
O.T is the zero notch on the crankshaft pulley , print it and glue it on , then use a timing light hold it on the point and turn the distributor , when the notches are in line its ok.