Well it is not your original bolt pattern.
I'd guess from the small picture that it has 6 lug Budd (stud centered) wheels. Also suspect it is not a GM chassis, not that it matters. Oshoksh and perhaps some others did use that bolt pattern for step van chassis.
Without a good plan already I'd pass on that chassis. Then figure out what you're trying to do with the truck and make a reasonable plan.
