I just don't like that tin stamped valve covers, chromed or not.
I always ran the Aluminum valve covers when I ran my Fords or you end up trying to Peen all the bolt holes
with a ball peen hammer, and that still does not guaranty that they won't leak.
I'd also be checking the connection for the oil Pressure where it connects to the engine Block.
Make sure that's not leaking or spraying with that much oil pressure.
I would open the hood start the car run it up to 3,000 rpm's and stand there and see if you can see any leaks, for a while.
I still keep a set of tin valve covers that I cut the tops out of that can be bolted on so I can adjust or look for problems in the valve train while it's running.
Best of luck let us know what you find. thanks.