It sounds like you made some good choices for a moderate horsepower increase. You will still have an engine that still gets decent gas mileage and has good low end torque - nice if you plan to use this pickup as a real truck.
Now take a look at the other items you can upgrade to get a little more power.
Good headers with full duals, an H pipe and high flow mufflers (I like Dynomax turbo mufflers) will help power, and you should be able to keep the sound at a level acceptable to your Dad. Tuning the computer is the next step I would take, but watch out for tunes that require premium fuel. They will work fine, but take more out of your pocket each time you fill up.