Search the forums on the word timing and you will get a few thousand hits.
The marks on the flywheel are a good place to start.
Setting the timing with a vacuum gauge, adjusting the distributor to maximum vacuum at 2000 rpm will give a good timing setting.
Another technique that is quite good is to advance the timing until you hear engine knock when accelerating. Then, retard the timing until there is no ping upon accelerating.
I like the vacuum technique because it is easier and quicker to do, and because I also use use vacuum for adjusting the carburetor mixture.
