I can first hand vouch for this motor living up to exactly what was said, I have driven the gtr with this motor aswell as watched it do its quarter runs, 12.49 at willowbank back in 2008 (late). the motor is very good on compression if my memory serves correctly, there were no known issues with it besides the dumps being cracked/shagged.
clutch is nice, very bitey but still driveable!! Good package all round, tempting to buy it myself and shoehorn into the 180....
good luck with the sale mate!!