Ok, i am not sure how to do that. I am new to turbo Buicks. I noticed this did not look like a stock turbo. But I don't know what has been done the car except a few items.
It looks pretty old. Is there any shaft play? As Boost231 said if you want to know more you need to remove it. Pull off the compressor cover and exhaust cover and mike the wheels. Does it have any markings or tags on it?