If you'll pay shipping from northern CA, I'll give you a turbo off a GM 6.5L diesel truck. Turbo worked fine but I upgraded the truck to a larger turbo. It's missing the vac operated wastegate however.
I have a kkk turbo off a yanmar 4lh dte. It works but has exhaust side clearance issues. Hence it being replaced. Should fit your needs and you're welcome to it. I will be travelling from ny to R.I. today or tommorow on I-95. I'll try to figure out this P.M. thing and send you contact info. Im still a bit in the dark ages with this computer stuff. Hope i can help you and your students.