I bot a boat and motor couple months back. Was told it was a 93, 70hp Evenrude. Model # states it is a 94 (E70YLERV) Owners manual says use Champion QL77JC4. But the plug that is listed for the 94 is QL78YC. What one should I use?? Not a big problem but they are too different plugs. Any advice,,,Thanks,,Jerrio59