I have a 1981 Evinrude 70 hp on a 1981 Galaxie Tri Hull.I am replacing the exhaust cover gaskets on it.I seen a article ( service bulletin) about moving the tell tale 90° elbow to the top of the engine to prevent upper cylinders from getting to hot due to the elbow being so low on the exhaust plate.Since I have the cover's off could someone please tell me the measurements where I need to drill the new placement hole. Thank y'all in advance, and thanks for letting me be on the website..