sierra2011

Hello everyone. I"m a new member here from Quebec. I own a 2011 Sierra 4X4 crew cab. Few mods to it. But I"m looking at adding a mild cam but not looking at replacing spring or anything. Just junk out the original. Lookin for a little performance and a little rumble, and ofcourse I"m on a budget. I've read swapping from a LS1, or Z06. Can anyone help me out? it a 4.8liter engine