Depends on so many things man - are you going to increase compression? How wild are the heads going to be grinded and will they use oversized valves? What the cam specs are?...
So variables, these are just a few. I'd never waste time and money putting in a tiny cam, so make sure it's a decent improvement over the stock one or there is no point - in other words, not a "stage 1" cam, as these are usually just "towing cams" or used to touch up the torque a little bit, but make no decent gains for what it cost to change a cam over.
I'd say if your playing it fairly tame with the gear your planning on getting then you might walk away with 130rwkw. Which is about 20rwkw over a stock ecotec running well.