There is NO amount of camber that will allow a fitment like that on a stock bodied NSX. Take a look at the picture I posted above and imagine a
41mm Spacer added.
The Craigslist Classified states that the wheels are
19x11.5, so I took the liberty of looking up the fitments for the Work VS-XX. Here they are:
http://www.workwheelsusa.com/media/wheels/26/75/VSXX_PDF.pdf
The closest fitment to a 19x12 +20 available is a 19x12 +23 which has almost a 5" lip (this car doesn't have a 5" lip from what I can tell).
For the 19x11.5" sizes, the most doable offset is the +42 which has ~3.8" lip. I would put my bets that these wheels are that size:
19x11.5" +42
That size only puts the wheel 12mm outside of the one I posted above, which is still pushing it, but probably doable with the right tire, camber, and fender rolling work.