Is this dangerous?

Hey guys, I'm swapping a 5.9 Magnum into my Dart. It's a low mile motor that sounded great and ran strong so I'm planning to drop it in with just a few new bits and pieces (oil pump, timing chain, etc). I pulled the harmonic balancer off today and here's what it looks like.
20181021_224738.jpg

I'm assuming this should be replaced? I have a spare balancer from an LA 318. Will that one work on my 5.9 Magnum?