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The right engine is most certainly not a VVT

The vehicle architecture does not support vvt, and there's no easy aftermarket hack way to retrofit it easily.

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OK, well I'm assuming this won't be a plug-and-play deal and that you may have to splice a few harnesses (which may be way more than the OP intended)

If you find a cheap 2011 engine and controller, why couldn't you use it in an 05-10 LX? They're both 5.7s and my understanding (albeit limited) is that most if not all the VVT action happens in the block, since the cam is in the block.

Maybe there would be compatibility issues with a 2011 vvt motor and an 05 trans?

If you can put an LX drivetrain in a 40 year old E body, why can't you use a VVT motor in an 05 LX?

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Because all the electronics communicate with each other on modern vehicles.

It's just a tad bit more work than splicing a couple harnesses....It's more like find a 2011 vehicle, then wreck it by ripping out 99.999% of every electrical part (not just modules....more like damn near everything electrical), somehow hack all of it into the 2005, and even then....
good luck.

The dome lights, the seats, the radio, the cluster, the cruise control, the shifter, the airbags, the column and on and on....damn near everything electrical and everything that runs it....communicates.

That is, assuming he wants it to start, run, and have working electrical devices

Everything's cool Molloy..no disrespect intended....but advice like that is what gets people in huge trouble....he'd have better luck putting a stock 6.1 in it than anything vct/vvt. 2009 and later is an entirely different architecture and it can't just be thrown into anything.

It would be cool if it'd work, but it won't and it would be a ton of work....to make it work