It's definitely a Ford. See here: Automotive Belts & Hose Vin Decoder | Gates Corporation
Your particular VIN (1FDWE45F9YHB5542
) decodes as follows:
Manufacturer Ford Motor Company
Model Year 2000
Model Econoline (Super Duty)
Engine Series V-8 7.3L
Engine Capacity V8, 7.3L - Turbo
Fuel Type Diesel
Vehicle Type Van
Country United States
So unless I'm milking without a bucket, that's basically a T444E, aka a 7.3 liter, which was a very reliable motor in the smaller busses and big pickup trucks. It's a workhorse. It's Ford's rebranding of an International design. And the mileage is basically nothing... just getting broken-in.
If they maintained this bus, kept it fed with clean oil, and there is no rust, that could be a very good deal.