The ball comes under the pointer twice, once when #1 is ready to fire, and again one turn of the crankshaft later, when #6 is in firing position. Pull the valve cover, and look at the #6 valves- - - -NOT #1! Get the #6 exhaust valve closing (last one in line) and the #6 intake valve opening. Now align the ball, and use the cap tower the distributor rotor is pointed toward as #1. Follow around in a clockwise direction for 5-3-6-2-4.
When the #6 valves are "rocking", (exhaust closing and intake opening), #1 cylinder is at top dead center on compression, ready for the plug to fire.
Jerry