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The HEMI swap isn't too bad depending on the model and whether or not its a 4x4. I'm just finishing the swap on my 02 4x4 Sport and I'm loving it so far!
Yeah read up on some of the Hemi swap threads before you decide. IMO I think it would be dumb to go back to "old technology" for the same amount of work possibly.
You would be better off going with a built 4.7 since thats what you have now. 5.2 has the same power and gets worse mileage. You would save tons more money going with a 4.7.