not a highboy, and probably not a good decision, unless you have lots of money to throw away. i don't live up there, but illinois is hard on vehicles with rust and age damage. looks like something to part out or scrap. i don't know the price conversion, but unless it's a napco conversion or something, it is not worth more than a few hundred
I think maybe I would go half of what the asking price is. It's about 3 hrs. away from where I am. I think here the price would be a little higher than in your area but I could be wrong.
I have been told the box isn't year correct, it's not running, it's probably been sitting in that field for 20 years or so. Hard to say how much has been picked off it over the years. If it had good floors and cab mounts etc. I would probably go and take a look and I'm sure that's what I would be told.
I'll probably give the owner a call and see if he still has it. If he does I'll ask a few questions.