My guess is that you would have to get some custom ground to your own specs...It is VERY hard to find internal performance parts for the 4.7 (at least in the U.S.)...More than likely you will have to deal with "custom specialty shops" to get anything worthwhile...and you know what that means..$$$$$$$
and of course...1 mod usually requires another mod (I.E. -cams may require ECU work to get the maximum benefit..then injectors may need re-calibration......etc...)