Assuming a proper amount of airflow, 8 lbs of boost should put the NA XF at 330 crank hp. Maybe 340-360 depending on how much the top end is helped by the forced induction. That's unknown territory. Then subtract the loss due to supercharger inefficiency. My opinion is that such a setup would make around 290+ crank hp.

I think Chuck Norris was making a joke regarding the whole roundhouse kick to the 350z remark. Don't you get it? 350z into an Infiniti? (Nissan's luxury line)

You should check out the Chuck Norris jokes Mike, they are pretty funny.