The opening and closing of the points is what allows the coil to generate the spark. The points must be gapped while at the high point. If you gap them on the flat, they will never close and the coil will never release a charge.
With the rubbing block on a high point, set the gap so that a .019" feeler gauge barely slides in. When you crank the engine so that the rubbing block is on the flat, the points should be closed.
Vikki 1969 Goldenrod Yellow / black 400 convertible numbers matching