5.7 Eagle build thoughts...

I think the big obstacle is just figuring out how the VVT is actually controlled. I would assume it's not just an on-off style valve and instead more like a servo control with a sweep of motion that could be controlled by something like pulse width modulation (PWM), similar to some idle control valves. In fact, now that I think about it that makes a lot of sense. The control mechanism might essentially be something similar to an idle control valve that advances or retards the cam based on a number of steps.

I think actually actuating the VVT would probably be the easy part, figuring out the conditions you want to operate it under would be the real challenge. You may be able to do something as simple as retarding the cam under low rpm low load conditions for torque and ramping it up as the rpm and load rises, either linearly or using some curve you determine. You may not have factory style performance, but you could still see a benefit. Sort of like MDS. Theoretically you could just have an on-off switch for the solenoids, but you might notice the power change unlike a stock setup that monitors a lot more sensors and tries to make it more seamless.

You may look into the VVT system used in the Viper. It's a little more exotic cam-in-cam design that only advances the exhaust lobes as opposed to the whole cam (I think it still works that way at least), but the actuation system may be similar. Since it's something Chrysler has already designed and used I'd think they would probably try to take some parts and technology from it. Also, since it's been around longer there may be some more knowledge as to how it's controlled that you could research for ideas.