Some news,
It's not the valve cover breather because I have checked that this week end, putting tissue on it and go for a ride = All dry on both of them.
Next try : On each red valve cover, there is a place where we can put a de tomaso logo plate. I don't have it so the space is free and there are 2 little holes on each to fix those plates...it would really surprise if nothing is there to "close" those holes. But it really could be that when I see where is the oil...
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