Other than the BS about the B body and FMJ spindles, this article is really good for a parts list, etc.
http://www.moparaction.com/Tech/archive/disc-main.html
For an A body, the additional or different parts you need are the prop valve, 73-76 uppers/BJ's, 73-76 Lower ball joints, 73-76 brake hoses.
I may have missed something, pretty tired right now.