I have no update on this, sadly. Weather went to crap and so did work demands, not to mention I wound up spending considerable time working on both the late-model hemi critters around here ('04 Ram and '12 Charger R/T). Nothing other that what wound up being routine stuff, but have you ever changed the plugs in a hemi Ram? I've done it to this one since new, but this was the last time I'll ever do it - my rearranged and scarred innards won't take it anymore. Cancer is a [censored], especially 3 times. Someone else can do it next time.
Plan now is when the weather gets dry and warm enough to allow it, I'm going to take it by a local fellow who owns a repair shop to have a listen. He's a Mopar guy and has restored some in the past. We'll see what he thinks in person.