I'll give ya $2,000 bucks for it.....and you can keep all the stuff that's inside.....just kidding That 408 is a good engine.
It is a very nice conversion, but i think you'll be hard pressed to sell a used school bus for that kind of money. Unfortunately, there just isn't much resale value in converted buses. Especially ones that are still painted yellow.
Pretty much all conversions i've seen for sale go for less $$ than the the owner put into it.
I wish you good luck though.
Quis custodiet ipsos custodes (who will watch the watchmen?)