Cammed 2006 5.3l question.
I specced my own cam based on alot of research and I am very happy with it. The Best V8 Stories One Small Block at Time

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Auto or manual? If auto what converter?
What rear gear and tire?
What bolt ons? (headers, intake, etc)
What timing and air/fuel are you tuned at for WOT?
Are you sure everything is mechanically sound and you are getting WOT at the throttle blade?
Could be any number of things leading to subpar performance. Also always possible the regrind cam went flat or wasn't ground correctly in the first place.
T56 trans.
3.43 rear end gears 275/40/15 tires.
Mechanically sound
I'm a little bit lean on wot think I need to upgrade my injectors on that point but not that lean.
I haven't looked at The throttle body itself but hp tuners was reading wot with pedal down.
Ported stock heads not milled or anything though.
Exhaust is 2002 f body manifolds true duals to magnaflow drag mufflers.

