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I have used the method Tim has linked to with good results. If you use that method, once you have found TDC, take a piece of tape and mark the top of the harmonic balancer. This way you will know when the ball (TDC or 180 degrees) is coming up on the flywheel. It makes it easier to locate not having to keep an eye on the flywheel all the time.

If you use Dragsix’s method, it makes it easier to mark the top edge of the distributor with a paint pen to help locate the TDC of each piston. You can accomplish this by taking a piece of masking tape, cut it into a 1/4” strip then and wrap it around the top of the distributor base and mark where they overlap. Remove the tape and use a ruler to split the tape into six marks (the overlap mark counts as one) from end of tape to the overlap mark. Now with the rotor pointing to the #1 firing order position reinstall the tape so the rotor is pointing at one of the marks. Now following the marks and use a paint marker to mark the edge of the distributor, so you will know what valves to adjust by the position of the rotor.