I'll have to check. I've done the research before and believed I found that I have the 72-down power steering box. BTW, I've looked at those pictures on bigblockdart.com, and those are just manual steering boxes shown, correct? (That site has a lot of good info, even if you aren't putting a big block in your a-body.)
Here's the thing too. Because the one I've posted in the pic above didn't work, I ended up ordering a pitman arm from the local parts store, based on the 1971 year of my car. It fit. So what I concluded was I still have the small sector shaft power steering, and this pitman arm is for something even smaller yet. It looks very similar to the one on my but is a bit smaller. This is what made me think maybe it was even an older a-body that lots of times had smaller parts. But that was just a complete guess, and why I've posted the picture to see if anyone else knew.
I'll double check the sector shaft size and clocking from the one on my car, but from what I remember it's very close to the same, just a little smaller.
