Why was it apart? Does it need a rebuild? Car motor or a truck front on it. I've got a car intake for it if you want it, but it doesn't come with injectors or fuel rails.
There are lots of threads on here and Moparts that give the details of the install, so check them out, and come back with specific questions. There is way too much put in a response.
I'm just finishing my 5.7 install, and have learned quite a bit. Its certainly not easy, but it can be done. Good luck.