Your figures are a bit wrong
Although you got the figures from the official Chevy website but your assumptions are a tad bit off as well.
This car indeed is the Z06, you can tell that by the bigger fender flairs, the nostril in the front bumper the wheels. Also the biggest give away that it is a Z06 is the little emblam on the left fender right before the wheel in the last picture it says "Z06" if you look closely.
^^Here is that badge up close.
^^Compare this picture to the last picture sparky posted.
The reason why you cant tell by looking at the motor that its a LS7 motor is because he has taken the plastic cover off of the engine that goes on either side of the motor. Compare the following two pictures.