I would want to see it running before I purchased it otherwise I would want a huge discount to compensate for assuming the risk that it might not work or needs expensive
parts to make it right. It's a crap shoot without a warranty from the person selling the engine.
If I just wanted an engine that I know is going to work, I would not
purchase it. If I was trying to save a lot of
money and am willing to take some risk then I might
purchase the engine.
I think it would be unwise to purchase an unknown without a big discount or a warranty.
It depends on where you are with this.
Also,
Volvo OEM
parts are super expensive if anything needs replacing. This is how Volvo makes its
money, selling competitively prices engines and then later
price gouging you on the parts.