Howdy first post here. I have a 1968 Chevy c20. I just put in a new 350/350 crate motor. It started (with a little help and info from your forum). I am stopping the clacking noise from the valves right now. It has a timing gears and is super noisy. As I am getting rid of the valve clacking noises, I heard this noise coming from the bottom of the flywheel area. It's clicking and clacking. Loud noise but coming from the small pan under the flywheel. (I used a hose up to my ear to find where the noise was coming from.) I had the 4spd granny trans rebuilt and it seems to work fine, just this horrible noise. It has a new clutch. When I push in the clutch or engage the gears it all works fine. The noise gets worse if it's in neutral. The noise is not bad if it's in gear going down the street. Clutch adjustment? Not sure what else it could be? Something put together wrong? Help? ?