Magnoom already spoke the truth- If you're not an absolute freak, not fearing fabricating and expenses, you will probably give up half way.
If you take all the cost together, you'd probably be better off to just buy a refurbished 4.7 somewhere- or even a new one- the internet is full with sellers, selling those engine in every state- naked to fully equipped and ready to install. It will not be less cost and you will know for sure, you will not be stranded somewhere, because you did not know, the loose cable somewhere needed to be connected to something what is not even there.
Opinions are like buttholes- everybody has one. :smileup: