worn out or what?
well i have heard of people taking junkyard motors and boosting these 5.3 and making good power .... i am wanting to make the truck a little faster but i dont know if with this many miles if i should just drive it as is or if i can have a little fun. the oil psi reads at like 60psi at idle so good pressure there. it runs smooth ... so where to begin?
If you haven't change the oil yet, collect a sample and send it to Blackstone Labs for analysis.
The LS is an excellent engine, probably the best V8 ever developed for a street car/truck. But 250K miles is a lot even for an LS. If you really want to add boost, I would go to the bone yard and pick up low mileage replacement first. People are adding boost to junk yard motors and making good power. But what they don't really tell is about longevity.
Don't forget to check everything behind the engine, too. Sudden jolt of power from a nitrous shot could do some interesting things to the u-joints, or differential.

