The new bushings I got were a little different than the originals, so the best I could do was to eyeball the depth to which I pressed them into the brackets. But the difference could not have been more than 1/4"; which should not be too much to compensate for by normal adjustments.

Wear on the inner tire edge is from too much negative camber, as you found out. The worn upper joints can contribute to that. I've also seen rotting frame rails that allowed the whole upper arm assembly to cave in. That van was done for; I hope that's not the problem on your van.