I was also wondering if anyone knows 1) If there is a company that makes performance engine rebuild parts for the 4.7. and 2) also are they worth it to do to this engine and if I did this would I have to do anything extra to the tranny or rear. I am looking to get as much performance out of my 4.7 as possible, without going the Nitrous or turbo route.

 

KRCperformance.com offers a line of components to up the performance of your internals for the 4.7. I have not used anything they offer (yet) but they look promising. It's a good starting point. Good luck!