Put another way - the balls must be facing each other, bottom facing up and top facing down. Did your new fork have new cones on it? If you are reusing the old cones make sure they are seated as far as they can go. If the old cones have little dents in them then a tiny bit of play is necessary, otherwise get new cones and adjust so there is no play, but the bars and wheel can flop to the side by gravity.