Strange Metallic Whirring Noise

Update on this: Still trying to find the source, all the while I have put another 700 miles on the car with no change in sound, running, or oil pressure. This included a 300 mile roundtrip about a week ago averaging 17 miles to the gallon mixed. I changed the oil after and it was clean with no metal shavings. I was able to isolate the sound to the lower front right area of the engine. I pulled the fuel pump and checked it and all looks well, with no abnormal witness marks on the pump arm. The eccentric seems ok as well. I pushed on the Cloyes double roller chain which has been in since the rebuild years ago, and there is less than an 1/8” of slack. So unless there is far more slack on the other side, I can’t see it hitting the inside of the timing cover and its more of a squaking type of noise anyways. Water pump is fine. With that said, I am still searching for the culprit. Noise comes and goes and seems to fade away after idling for a bit. I have also noticed that the easier I drive, the less frequent the noise is present. Unless I run across the cause, I have decided to just “run it” and see how things go.