It's a highly modified car. While a PPI is a great indicator of current issues, it's not a crystal ball.
Recently a high HP GTR was sold that had not one, but TWO PPIs done before the transaction was completed. Within 50 miles, the motor blew. Logs were pulled, and the car was not abused at all in the 50 miles. Just the nature of the beast. On the other hand I know of people with 30k+ miles of abuse at well over 1000whp with zero issues. It's a crap shoot.
The factory GTR rods are awful. So awful that stock turbos can bend them with ease if the torque is not kept in check lower in the revs.
Why someone would toss a stock rod engine in this car is confusing.
Do you plan on building the motor or doing anything?
If not, Alpha 9 is not for you. You are sacrificing spool for power that you can not use on stock rods.