Superstocks really don't ride well. Have them on one of my cars & ride is really stiff as well. Now the car does feel solid when I'm rowing the gears but otherwise I'd never recommend them for a 90% cruiser.
While I have a line on an a-body 8.25, I do already own a nice 3:55 posi rear that's in one of my volares. Has anyone put one in a dart? I can weld new perches so that's not an issue. I know they're a wider, just not actually sure how much.