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Heck, your at 390 hp stock. A cam and longtube headers will get you close. Your budget will really determine how far you can go: cam, heads, blower, Nitrous?
What about the trany? Or a 2600 lock up Torque converter for better take offs.
In the preferred vendors to the right--->>> you will find a couple of sources with the term 'performance' in their titles. Contacting them would be a great place to spec out your options.
He can do 450 at the crank with a good set of BV heads and a good cam with some tuning. If he wants at the wheels its gonna take some stroking and boosting or being bottle fed. While to motor is out I would get the trans built up for wanting to push that power level at that many miles.
Okay did not account for generation.Its a 04...