I would've thought that there's no way an '83 5000 should have an Ignitron module.
Anyway, I checked in the back corner of my mind and I think any newer EMAB one-piece ignition from a 500, 5000 (or Husky 50, 51, 55, 154, etc) should drop in with the same flywheel. A 400 ignition would also work but the HT lead will likely have been trimmed shorter.
If you're in doubt about where the fault lies and your other 5000 has an EMAB igntion, you could swap it in and see.
Just found this thread
https://www.arboristsite.com/commun...55-ignition-diy-ignitron.279214/#post-5347536