The throttle body is for top end power and really would be a waste without the boss intake which will also gain you more top end but you might lose some bottom end power which is what you need with a lift. If you get headers you should redo your entire exhaust. Getting an intake won't really help your low end either IMO but a tuner can help you in the entire rpm range.
Want more off the line power? Do you have 4.10 gears yet, if not you could get those.
A tuner will add power but mostly it will make you feel more power because of the way they manipulate the throttle and transmission. It's still probably your best bang for buck though.
I agree that throttlebody spaces on something that is non-TBI or carb is just a paper weight.
2012 XLT Screw 4x4 5.0
Mods: A couple bolts ons (supercharger, etc)
Tuned by ME 11.72@117
98' ExCab 4x4 w/03' 5.4 swap
The work truck...for now.