Beautiful Cobra, congrats
The folks over at 460Ford.com will tell you a few tiny leaks like that are totally expected, and normal
essentially your car is "marking its terrritory." But as mentioned above, new engine/car break-in intervals are full of various sorting things out projects, which always includes leaks
With the 460 there are a few extra places potentially troublesome, like the upper outer (driver's side) bellhousing bolt which is open to the
oil galley area and needs to be installed with sealant, and various other sites to check including
oil pain, valve cover gaskets etc. Keep checking regularly and keep after the leaks and soon you will know exactly which ones are entirely "normal" for your car and which ones need more investigation
Lots of info on SCOF about this, also at 460Ford.com and can do a search on the big block forums at ffcobra.com