i live in michigan, but about 500 miles from that bus. IT appears to be a fine bus, but i personally woulnd't spend more than 1,500 bucks on it, and that seems kinda on the high side. The 9.0 liter will run forever, but its' wimpy. IT's a huge engine, with only about 170-180 hp. You could find a newer bus with air brakes from a school district for far less money.
some negative things:
That deck is really ugly! no air brakes, at545 trans is extremely common, but sucks up a lot power. I have that trans in my bus, but I think you'll read a lot of negative things about it. However, being mated to such a wimpy engine should really increase the transmission life. 250,000 miles is a lot of school bus miles! The bus is old....18 years if i did my math correctly.
the 9.0 liter is one of the most fuel efficient mechanically injected skoolie engines available, and it's bulletproof.
My guess is that it'll run for a long time. I would immagine you'll have at least another 50K relatively trouble free miles, but any bus you buy is a gamble.
How are the tires??? @$300 bucks each x 6 tires, this is an important factor.
Quis custodiet ipsos custodes (who will watch the watchmen?)