replacing upper control arm

Hampton, I bought those UCA's and the ball joint popped out on the highway. Luckily, I didn't lose control and kill myself and my daughter. They are cheap metal with cheap ball joints. If you plan on upgrading to disc brakes in the future and have an ealier A with the smaller ball joints this might be a good time to convert to the post-72? (someone correct me) ones with the larger ball joint.