BMF, I would be very interested in the results of swapping out the supercharged 5.4L for a 5.2L VooDoo engine as I am sure you can and will do. More power to ya! And I really did not say it could not be done, just that there might be a disappointment.
I am aware of earlier attempts of utilizing a FPC in a 4.6L engine which were in fact a pretty major disappointment to the team trying to utilize this crankshaft technology in larger displacement engines. The issue here is not engine weight or transaxle gear ratio in the GT at all, it is the engine itself.
As you are well aware, there are critical joints within the engine which much be maintained. The dynamic forces generated by the FPC arrangement generated vibrational loads within the engine which loosened main bearing caps, oil pan bolts, valve cover bolts among others. The inherent rotating forces shook the engine apart. Without fully understanding how to damp these modal harmonics with both active and/or passive systems, some of which may be external to the engine, the transplant of a 5.2L VooDoo engine might lead to short engine life. And this might be viewed as a disappointment for some.
But I still applaud your efforts to move forward with this swap effort. Keep our Forum updated with your progress and results. Perhaps you can design around these issues.:thumbsup