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The Ecotec engine is actually pretty much a direct drop in, if you have the transmission. You'll only need mounts, the radiator that came with the Eco, and the PCM. I don't think you'll be able to use the tranny from the 2.4. It's the same transmission (4t40E) but, if I remember correctly, the bell housing is different.
It will, however, be a hell of a lot easier to just get one with an Eco already in it, like you mentioned.
Do you want the Eco for performance, or just because it's a newer, better engine?
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