67 Control Arm Rebuild

[jnocero]

I am going to rebuild my front end on my 67 C10. It is going to end up with drop spindles, air bags, and disc brakes. I have some hubs, rotors, and calipers from a 79 that I would like to reuse. Questions:

When I order the drop spindles, do I specify 79 to get the right spindles so the 79 calipers and hubs will fit?

Do the 79 spindles need 79 ball joints to get the right taper?

The outer edges of the big holes on the lower control arms are kind of chewed up (where the big pivot shaft nut seats on the arm). I looked at other trucks and this seems common. Do I need to dress that flat somehow?

Any problems with reusing the old control arm shafts and tubes and nuts after 43 years, or did I just answer that question?

What is a good brand of drop spindle?