That is another of Al Unser, Jr.'s coaches. Was on Ebay at the same Buy It Now Price in June of 2012.
We had a chance to look at one of Al Jr.s coaches ( I think it was this one) in Quartzite a couple of years ago. it had a bad soft spot in floor over rear wheels on curb side.
That's the same paint job as 422.. When the guy who owned it before me saw that paint job at the factory he reprinted 422 with the same graphics