How much I would make to the wheels on a VY Ecotec with Cam, throttle body, CAI, spacers, and tune?

Individual power gains on these parts are given below.

Cold air intake: +5kw
Stage 2 Camshaft: 19-26 kW
Throttle body: 10hp at the rear wheels
Manifold and plenum spacer combo: 10kW
Tune: At least an 8kw gain at the rear wheels in an absolutely stock vehicle

Power gains vary between different models, fuels, and the condition of your particular engine along with driving style. Generally though, these are the average gains you'll see with these mods.