I see, that's a bummer... that car does look familiar though now that you mention it, I've definitely seen it before but 2011 is 9 years ago by now (!!!). I don't get how someone could let a car like that 'go bad' but happy to hear you're bringing it back!
No worries! Glad to hear these wheels should fit, the calculator showed promising results but it's good to hear from someone who's actually done it. When you say 1/2" spring offset what is that in relation to? For my setup I had the spring perches on the axle housing relocated so the leaf springs still sit in the same location on the body/chassis.
Thanks for linking that list I was unaware there were multiple widths of 1960s 8 3/4" rears. Now I want to go check the width of mine again, I never confirmed what year it was or the exact dimensions aside from spring perch centers to make sure it wasn't a 1971-74; the guy who sold it to me just said it was out of a '67 Coronet.
Good idea for the center caps I hadn't thought about that yet. When you talk about machining the hub bores to a size for an existing cap, are you implying that keeping the bores a slip-fit over the hubs isn't necessary, or do you mean machine the outer edge of the bore slightly larger/smaller to fit a cap? I know on my other vehicles they have aftermarket wheels with a much larger center bore than the hubs so they aren't "hub-centric" and they work fine but they are on a Jeep and old 3/4-ton truck, my Duster gets taken to the track and will see hard cornering on a regular basis so I think having the extra support of the center hub fitting snugly into the wheel bore is a good idea at least on the fronts...?