Modifying an existing engine.... I agree with Wingrider - it's not worth the expense. In addition to finding a way to install the mechanics that adjust the cam timing, you would need new sensors and a computer that can read them and then send control signals to the cam mechanism to adjust the timing. Not a simple job. Were GM or some other company were to come out kits like they did for the LS1/4L60E gear so you can retrofit them into pre-EFI cars, then it would be more practical.
The new LS3 (vette) and L92 (truck/SUV) engines have the VVT technology too.
2008 Chevrolet Corvette LS3 engine Improvements - Feature - Motor Trend
