Set the engine to TDC. To find TDC, remove the spark plug for the number 1 cylinder, place a finger over the spark plug hole and rotate the engine until you feel air pumping out. Continue turning the crank until you line up the timing mark to TDC. On the distributor, there is a marker cast into the base where the distributor cap sits. It will be a triangle-shaped marker pointing to the rotor. The rotor needs to line up on this mark when the distributor is fully seated. As the distributor is placed into position, the rotor will turn slightly as the gears mesh. Note how much it turns when you pull it, then give the rotor the same amount of play when you re-install. Once the mark lines up with the rotor, it should be set.
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