I'm hearing a pronounced metallic "clunk" when letting off the clutch with a decent level of engine power. Doesn't occur during low power application. Noise seems to be coming from the dash. Any ideas as to the cause?

 

Maybe the return spring and spring box for the clutch pedal are failing and making that noise.

 

From the dash? Is your battery clamped down correctly?

 

I'd vote clutch helper spring - remove it see if the clunk goes away... If it does replace the spring