I've looked at the 4.7 swap. It's a good engine and I really like it.
However, there is little support in the aftermarket. You could swap in some HO cams and headers but that's it.

You're light years ahead by dropping in a 5.7 hemi and calling it a day. You'll end up being way ahead on power for the same fuel burned.

We are brothers and sisters doing time on the planet for better or worse. I'll take the better, if you don't mind.
- Stu Harmon