Hi, the tii distributor for 72,73 cars did not have a vacuum advance on the side of the casing. 74 had a vacuum advance and the points are mounted on the left side of the distributor shaft,closer to the fire wall. a tii dist gives you better over all perfor- mance and a stronger top end power band. i have thes new and used if your interested. good luck stone stone racing co phila pa 215.592.0265