71 valiant /6 starter not engaging

Well the wiring should match up exactly in the rotation and order but can be a little off in the clocking as the pickup can be slightly rotated. There are 2 adjustments on the slant distributor, the lower one is not usually moved but the top one does get adjusted for your ignition timing. When you bench test your starter does the bendix shoot out and spin or does it just spin in place? The flywheel takes up the space between the bendix drive and the nose of the starter.