steering box adjustment

On the 69 Valiant on the interstate the other day I was driving this for the first time really since I got the car. It seems to wander some going down the road. I think there may be too much play in the steering box. you can adjust the play some with the screw in the bolt on the top of the steering box cant you. Do you turn the screw in or out to do this. I think I did this on the Dart when we got it.