5.3L build advice

Hello,
I just received a used Chevy 5.3L Vortec engine (LM7) out of a 2003 Silverado. Everything on it is stock at the moment and I would like to build it so that it can produce more than the stock 300 HP and keep it naturally aspirated if possible. I was already considering changing the cam, intake , and throttle body but would like to know what others have done with these engines and what's recommended. Thank you.

Hi, I am wondering if it would be possible to fit a Corsa C Ecotec engine into a saxo vtr chassis? i plan to build a car from the ground up and want to use said engine, but if its not, what engines would yous reccommend?