1969 GTS 383 With Power Steering

I have absolutely no documentation to prove this, BUT- years ago I read (can't remember where) that Dodge claimed that power steering would not fit the big block Darts, so they did not offer it. Plymouth, however, offered it as a dealer-installed option on the B engine Barracuda. My best guess is that it didn't lend itself to an assembly-line installation, but would fit if added after assembly... If this is true, I would assume that more than one Dodge dealer did the same conversion so as not to let their Plymouth cousins one-up them. Take this for what it's worth: equal parts ancient memory and speculation.