Recommendation needed

[minendrews68]

My son has a 2005 Crew cab Chevrolet Silverado 5.3 2wd, automatic, with 250k miles. The truck is bone stock and he is wanting a little more umph to it. The question is where does he start? If anyone has any ideas were open to suggestions. He's thinking a different cam, maybe headers, full exhaust, and cold air intake. But what else is going to be needed? For example, if he changes cams, would changing lifters and springs be needed? Is there a necessity to change cam bearings etc. When changing the cam I'm thinking changing the oil pump etc. Just need some ideas from people that have done this before.
Thanks for the help..

Carl