2008 silverado 5.3 to ls3 upgrade

So, watched all my tuning videos and did not see anything related to engine swaps or upgrades. Where do you begin? I upgraded to a 2010 LS3 with an ASA cam, dual valvesprings, titanium retainers,, supposedly 525hp setup. I have all stock components on the engine. I have the fuel injector table from the ls3 in the 2008 tune. The fuel system is regulated at 58psi via an Aeromotive regulator. I added long tube stainless pacesetter headers, 2 into 1 3" exhaust.

Hello Gregory

do ing an upgrade is just like starting a tune again, i start with safe timing numbers and work on fuel until i have that roughed out pretty close then head back to ignition tables and optimise them, then head back to fine tune the fuel tables and then the extras lie accel fuel cold start idle etc

Regards Ross