That article, although rather generalized, is surprisingly lacking in misinformation like most articles on the '73 SS wagon are chock full of.
One weird thing about my wagon... that article, among others and all GM literature I've found state that a rear sway bar is part of the option. But mine does not have one and doesn't appear that it ever did. I've seen incredibly nice survivors online and they have one, but none have had the base 2bbl 350 like mine. I wonder if you had to get the 4bbl or the big block to get the sway bar. Or maybe they just forgot mine at the factory. I'll probably never find out for sure.