: Dean, : Originally the gear had an indentation and not a hole.The pin will move in slightly depending on how deep the indentation is.You can check the distributor and/or the number one piston to tell where aprox dead top center is for cylinder #1.Then feel for the indentation. : Bob Dean..As Bob said the indentation is very slight, and the pin will only move in about 1/16th of an inch.To make the chore a little easier, remove the spark plugs and turn the engine over real slow with the hand crank.When you are close, the number one piston will be at the top, and the 2 valves will be closed.Look with a flashlight. You can also rock the car while in third gear by pulling on a tire rim a little each way till the pins drops in solid. Another thing I did was to fabricate a pointer with a right angle bend in it and attached it to the top timing grear cover bolt.Then I put a dab of white paint on the crank pully adjacent to the end of the pointer to aid in the timing the next time.
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