very cool.
love the old stuff.
a 454 is definetly in order.
you might be able to get it it running as is but almost guarantee hydraulic and rotten breaks among other things.
have resurrected a few old vehicles but not a bus YET.
good luck and keep us posted?
challenging times are ahead but in my mind??? if you have the skills to even consider it as the one for you then go for it.