Vibration in engine- help!

All the input helps, I can eliminate things if I know what to check. This is a huge help so keep it coming.

I'll check the damper, but it sounds like if that is the issue it would need to be replaced.
Is there a way to check it without a light?

I'll check the bellhousing bolts. When you say pivot bracket, do you mean the Z bar pivot bracket on the bellhousing, or where the clutch fork attaches to the inside of the bellhousing?

Would a bad throw out bearing be visibly bad, or do you need to take it out and inspect it?

The flywheel balanced? Not sure. The tranny was rebuilt years ago by the second/third owner (father/son) and I believe they replaced the clutch at that time.

Probably not much chance of figuring it out and getting it fixed by the Saturday Mopar show.

Here are a few pics: its pretty greasy between the clutch and the tranny, slight leak from the input shaft, but I can stick my hand right up into the pressure plate because it is not a diaphragm clutch, and it is not wet. The oil pan is leaking, but not the rear seal.