disk brake options (factory) 73 Scamp

If all your doing is the disk brake swap to the 73+ stuff you definitely don't need the book, this article covers the FMJ swap.

Swapping Disc-Brake Spindles - Mopar Muscle Magazine

Condran's book is useful, but it goes back to when you could easily find all of this stuff in a wrecking yard. That time has pretty much passed, and everything you need is reproduced new now.