Well keep in mind the 5.9 magnum was only about 230-240 horse and 300ish ft lbs. and it had a roller cam in it to begin with. A more aggressive roller cam and some headers will help it breathe but you're gonna be limited by the factory injection set up. 12s would be easy but mid to low 11s will probably take spray or more than an intake/carb/cam depending on your set up
