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Thats the thing, the market for the 4.7 is no where near the market for a 5.2/5.9. They don't make heads and cams and intakes. Its hard to even find s/c'er kits for them.
actually, you CAN get cams, heads and intakes for the 4.7. and theres an adapter available to put any ford modular engine supercharger on the 4.7. That means you can get the Whipple supercharger on a 4.7. The 4.7 is starting to build its own aftermaket