We are getting a pretty good amount of oil, it pools up especially at the base of the right side carb. I am also searching for the PCV valve, to see if it works.
Again - I don't do Earlies , but I think that the 1960 only had a road draft tube and not a PCV ? Even most of the newer Vairs didn't have an actual valve but used a fixed orifice instead.
Your engine may have more blowby than the draft tube can relieve.
Another thought on the leak. If there is a leak in the top cover area the cooling fan will push the oil outward and blow it out under the top shroud on to the head.
If you remove the oil fill cap with it running do you get a lot of pressure and or smoke coming out.