[Va68goat]

STEELCITYFIREBIRD,
We have run the motor with the passenger side valve cover off. Here is the video. https://www.youtube.com/watch?v=KAwSYevxsb4

The knocking is more noticeable at lower RPM and is drowned out with more RPM. The knocking noise is predominately on the passenger side. It's definitely not an exhaust leak. Thats been checked about a dozen times.

dataway,
We ran another distributor and plug wires and the knocking noise was still present. The tech also added a gasket to my original distributor and the sound did not change at all.

[Bentwheelbob]

Taking a Sharpie marker and coloring in the wear area on the oil pump driveshaft would quickly eliminate or validate current rubbing/interference as a possible culprit.

[Va68goat]

Here are a couple more pictures that may help.

[dataway]

Originally Posted by Va68goat

dataway,
We ran another distributor and plug wires and the knocking noise was still present. The tech also added a gasket to my original distributor and the sound did not change at all.

I mean the pad on the block, so no matter what distributor is used it would still be off. Not your problem I'm sure, just brain storming.

I still think it's going to be something so simple that no one ever thought to look at it.