Fully warmed up my oil pressure used to be 40 or better at idle and 60 above idle. At this time it is 5 at idle and 20 above idle. I run straight 30-weight oil, no synthetic, and I use Engine Restorer additive. I have discovered that Engine Restorer really helps the rings seal at high RPM’s.

The oil and filter in the photos only have 200 miles on them. Besides being very dirty it smells burnt. Ray Barton said to run 6 quarts of oil even though it has a 7 quart pan. I measured what came out. Including the filter there were 5 quarts of oil in the engine. It is possible that the pickup was exposed at 7K or so. Here is a link to some video from the last time I drove the car before I discovering there was a problem.
Cuda Street Exercising, Last Run