Sounds like it's a cutaway style? GMC van nose with a short bus body on rear? Vandura was GMC anyway. You didn't give much info but can't hurt to go check it out, if you're ok with its size. I'm working on a 1982 currently, but Ford. Lots of rust has slowed me down, not to mention the engine AND trans rebuilds.
Might only be a 5 digit odometer but can't say for sure. If they have paperwork backing that claim up, I've seen crazier things. The bodies themselves aren't too complicated. Very similar to a standard bus.
-Travis & the DawgBüs
<<1982 E-350 cutaway, Collins Bantam ext. body, Maximum 4x4 F-350 drivetrain conversion>>