340 Engine Shake

plumkrazee70 said

Here is the engine video. (this is with the driveline removed and a slip yoke installed)

Here is the video that started it all (I believe that the driveline shake was the end result of the engine shake)

Click to expand...

The noise in the second video is severe. I seriously doubt that the engine is the cause. Something is not right almost sounds like a loose filwheel or clutch.
How does the clutch pedal feel? Does it make that noise in all gears? Find the cause of the noise and you will find the vibration issue.
So us some pic's of the spark plugs. Im old school and dont trust AFR meters to many variables.