To be honest I’ve never owned or worked on a 4.7. Only heard the stories and read the posts. But I have worked on a lot of stuff that has slipped time and that’s what they sound like. And a 4.7 is an interference engine and if it slips time it will bend stuff. Sounds like that’s what’s going on. Is it worth fixing? From what I’ve read, no. But I’ve proven that wrong doing my own work in the past so you probably could with a few trips to the wrecking yard and some new parts.