The cam gears should have marks that point to each other. They also have "UP" inscribed on them. That should obviously point up. There is a little part of the cam that sticks out, that should be up when the gears say up. Make sure you install them correctly. The crankshaft also should be lined up with the mark on the oil pump housing.
So with the crankshaft, and camshafts lined up you should be able to install the belt. The rest of it is just spark plug wires in the correct location on the distributor cap, which would be shown in the picture above.