New to hp tuners

Hey everyone  I have a 1999 gen 3 Chevy Silverado 5.3.  Looking to add some timing to the truck and maybe boost up some other things.     Does anyone have a tune file for this   New and trying to look at different files and or get some guidance 

You will find the best collection of tunes on the HP Tuners site (repository) itself.  It's a treasure trove of opportunities for copy-and-paste.  There's also Sloppy Mechanics, but that could get you in trouble . . .

First, you don't want "a" tune file. You would want a tune file that matches the exact set of mods on your motor, or at least is from a motor that's closer to yours than to stock. So you'll want to start by listing what mods you have; anyone who offers you a tune file without any idea what your mods are isn't someone you want tuning advice from.

Also, LS motors don't really like a lot of timing. They have a very high flame front speed, and too much timing will reduce power. You don't want advanced timing so much as the right amount of timing for your build.

I am curious as to why you have singled out the advance curve as the target parameter to try changing and how you are going to measure/validate the results?