Supspention questions
The lower and upper balljoints from the 73 set-up are different than the eariler discs. Everything else will work just fine. Just get the 73-76 disc balljoints and you will be fine. Don't forget to get the upper control arms, they are different because of the bigger joint. Just Suspension,
www.justsuspension.com has some great kits. They have everything that has anything to do with the suspension, front or rear. You could order a kit for the suspension you have, it will work with the 73-76 disc stuff. I have heard that the newer discs are stronger too.