I have been restoring a late 60’s Dauntless V6. It has good compression on all cylinders and is tuned and running well. I also have a new timing chain and tensioners. However, there is a very audible clattering noise coming from the front of the engine that I have isolated to the distributor using a stethoscope. Therefore, I assume it is either the distributor, a sloppy connection between the distributor and oil pump shaft, or the oil pump shaft. Has anyone experienced this issue and successfully resolved it? Could the oil pump shaft have slop in a bushing? I think I will start by replacing the oil pump shaft and parts. But, I appreciate any advice.