Yeah, I second that.
I've just bought the same as you, but it was a spares or repair due to suspects timing chain slip.
I naively thought it would be a simple chain replacement, but ended up being a new block and full rebuild and setting the timing is a total bastard!!
The best advice I would give is make sure it's been well serviced and buy/borrow an endoscope to pop in the spark plug hole and make sure the bores are not damaged.
I'll never buy an R56 again, :-(