^^Just about spot on. Just to clarify some of the above:

N is a luxury level, not a model. HZ8WN70 is a MODEL, name is HZ Kingswood panel van.

Not all HZ have RTS but most do. Tyre options on some models can change this.

As it is a Kingswood it will have almost all the feature changes a Sandman got: Trim, chrome scuff plates, tail-light surrounds, full length headlining, door switches, carpet, grille badge etc. In HX and HZ a Sandman is basically a V8 Kingswood van or ute with stripes and GTS nose (the only reason it was based upon M70 & M80 and not N70 and N80 is because HX Kingswood had side strips so easier to use a base model and add Kingswood bits).

My guess is your van could originally have been a BO6 Kingswood van. Unusual to find these in 4spd as they were normally auto, so it could just be a Kingswood.