Your link is showing GVWR from 4850 to 5300. The lower values are 2wd trucks.Internet says 2011 Colorado with a 5.3 is 4100-4300 depending on which cab you get
I just don't want forced induction. Add fuel mods, upgraded valve body and all of a sudden you are 3k into it before tuning. I want reliable NA power. A friend of mine actually broke the crank on his supercharged 3.4What about supercharging your 3.4? That would put you closer to the 4.7 HP.