[Slammed84]

Sounds like you've covered the majority of possible causes.
Is it both sides? Seemed louder on the passenger side in the vid.

Wiped cam lobe? Bad cam break in? Something in the distributor? 30 psi seems low to me for oil pressure but its well within the safe range. Maybe connection between distributor and oil pump?

Unfortunately sounds like you might have to really do some digging. That would drive me nuckin futs.