So I removed the ps valve cover, rockers n shaft - noted forward most shaft bolt was missing spacer tab and instead had few washers...

I replaced with proper tab, cleaned and inspected entire assembly, no oil flow issues, shaft oiling holes installed properly downward towards springs. Reassembled n installed.

Fired it up - no schreech noise for first minute then started again.

Here's where it gets weird: When I remove the pcv valve breather she quiets down!

Ran it a few mins, noise comes n goes.

For poops n giggles I swapped in another distributor. Zero Noise!! - for only two mins cuz while patting myself on the back I reconnected the pcv valve n the screech came back louder about 10 seconds later so abruptly I jumped.

Any Thoughts? Not in a huge hurry to remove water pump n timing cover but I think that's next.

Point to note, has old crappy Moroso chrome valve covers(free) and a cheapo set of chrome breather n pcv combo - the pcv rattles back n forth noticably when installed; Power Brake vacuum line runs to rear of intake, TorkerII and pcv runs from front of carb, Carter 625cfm.