16 year old needs help with disc brake upgrade!!!!

If you have a digital camera, a picture would be worth a 1000 words...Are the 71 tie rod ends smaller than the 73? I wouldn't think there would be a problem there. Make sure you have the steering box centered (same number of turns to the right and to the left) before attaching the pitman arm. Is everything bolted down tight and the height of the torsion bars set? Weight on wheels?