Ok so I have a 2008 GP Base, Ive done some exhaust and intake work but, I am at a crossroads right now with either to go with headers or powerlogs, and i would like to go with new lifters and roller rockers, springs and rods. What the question is i have a few miles on the engine would the mods damage the engine? and if not should i go with LS7 lifters? thanks to all in advance for the info..