Do this,
Bring the number one cylinder up to it's top dead center.
What you want to do is feel the plug hole with a finger if you can.
When it's coming to top dead center, it will compress, as compared to the
other time the piston will rise with no compression.
When pressure is coming out of the spark plug hole, it's headed for the top
dead center for the firing stroke.

Put a small stick in the hole and carefully rotate the main pulley with a
wrench or whatever. The stick will tell you when it's top dead center.
Now look at the timing marks. If they are not in sight, you are off a tooth,
which is very common. You will have to rotate the distributor by pulling it
and lining up top dead center on number one and reseating the distributor by
rotating it so it fires on the number one plug wire, when you put it back
in.

You can play around all you like, but if you want to figure it out, you will
have to do this or something similar.