Need quick rundown 5.7 hemi apart

For that price, I would jump right on it in a heartbeat. There are not a lot of problems with the Hemi. It is just that there are so many of them out there, there are some issues with some poorly maintained/over-revved/abused motors.
Remember that people don't post on the internet when there engine is running fine and never have an issue. They only post issues of negative, looking for help.