It could be a Sandman, but nothing on the tags guarantee it. Body could be a Sandman assuming it belongs to the tags, but it could also be a Kingswood body. You'd have to inspect it.
As to value and assuming it was a Sandman, whilst it is optioned with a 4.2L it is not a 5.0L and it is a HX. Mandarin Red with Chamois/Black trim is not a bad combination. Totally restored it is worth less than $30k unless it is done perfectly and has its original engine. It'll cost a minimum of $25k to restore it in my opinion. So in my opinion it is already over-priced, but people pay stupid $ for Sandmans and Toranas at the moment.