Brendan
On my 21-studder, a line on the camshaft must be aligned with a line on the camgear. Then the dot on one of the camgear teeth must be aligned with the corresponding dot on one of the crankgear teeth.
Brenda, the line is scribed from the factory, on the cam, and the gear. The gear is installed corectly, on your cam, i showed you the two markes, they were lined up perfect....Ed