blow by?

grab one of the oil fill extensions that the later 318 / 360 motors had .
it fits in the stock location of the oil filler cap ; it extends the filer above the surface of the valve cover . I believe that they're welded tot he valve cover , but I'm just guessing there ...
I had one on my '72 Dart's 318 many years ago . I just pulled the entire valve cover from a 1980 St Regis police car that was in the pick-a-part ; can't remember how the extension was affixed ...
No more leaks / sweating !

Also , get some of those valve cover hold downs that the later 318 / 360 had . They're flat and act like a load-spreader .
These cut down on the leaks from around the valve covers .