So an oil leak in that area could be the tach drive seal or the valve cover gasket. The oil will travel during operation, so a way to trace the source is to clean the area and dust with Talcum Powder, then go for a ride. The oil will leave a track in the powder back to the source of the leak. Neither cause that I've mentioned is a difficult repair and doesn't require engine removal, etc.
We'll need more detailed explanation of symptoms to help with carbs