It's easy. Ease the crank around to tdc, then backwards 90* to get the pistons out of the way of the valves. Rotate the cam until the dowel pin hole on the cam/cam sprocket/dizzy gear is about half a tooth short of straight up, just ccw from it. Rotate the crank to the tdc mark. Install the cam sprocket to the cam.

If the chain is alread on there, life is harder. you can tie the tensioner back and rotate stuff and re-hook the chain on the sprockets and get it right. Just turn stuff slow to avoid banging the valves and pistons. Remember, in a 4cyl like the 2.6, two pistons are on the way up and two on the way down, down equaling up movements, so if you turn the crank 90* off tdc, the pistons are all halfway down the bore and safe from all collisions with valves. Just a little movement is usually enough, but better safe than sorry.