Hi Zach,
In the "hot-boat" business, there's a general rule.....if you have a 90mph boat, & want to go 100mph....pull 10K out of your wallet.
1K per mile an hour..!
That is a great motor you have there...stump-pulling torque & plenty of horse power.
/emoticons/
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The above formula can be cut by a factor of 10 (or more) for your truck
because you have more than the engine to work with.
For example; tires, axle gearing, Trannie & transf. gearing, etc.
Where do you need this extra HP..? I'm thinking your wanting road-speed ...... <_< These rigs aren't built for that & quite frankly, they can become more dangerous at higher speeds.. b-(
At 16, you've got plenty to learn & plenty of fun to be had just like it sits.
Now, if the current I-6 engine is "sick-n-tired" then there's plenty of power gained with a re-build.
There are aftermarket carbs, hedders & exhaust systems that improve performance. $-)
"Enjoy the ride"..!
Bob