I was able to drive my 3800sc swap for the first time (5 speed getrag, spec stage 3 clutch) and I am experience some shaking/knocking sound when engaging the clutch. It does not happen in reverse or when revving the engine in neutral. It occurs only when I am accelerating in first and shifting. I have never experience clutch chatter first hand so I want to see if that is what's going on or if i have a much more serious problem on my hands. I will add that after driving it a little it seemed to tone down a little, I am pretty sure at least.
Here is the video of the sound, and yes my phone is propped up in the heat sinks of the cpu