My 5.9 Magnum is eating 2 quarts of oil per tank. Time for a new mill.

So was the plenum gasket blown causing the oil usage?

No. The Hughes kit sealed it 100%. It was either a stuck or broken ring pack on cylinder #1. There were no marks other than ordinary wear on that cylinder wall either.

I ended up junking that motor. Now, I wish I would have kept that block as a core for a blower motor I want to upgrade to.