[el phantasmo]

My 69' does the same thing but it has nothing to do with caster and camber. My front end moves up and down because of the steering box being connected to the driver's side knuckle. The drag link has to be perfectly level or it pushes up or pulls down as it turns the tires. The set up is safe as long as your box is attached to the frame tightly and the frame is sound. If it bothers you put cross over steering on it. It would cure the problem and give you a lot more suspension travel. I am going to convert mine very soon, maybe I will learn how to post pics by then!