I just purchased a 75 glastron V156 to restore. Boat needs new floors, stringers and transom. It also came with a 40hp Evinrude Big Twin of an unknown year. I checked the model number reference guide on evinrudes site but no go. Best bet is it is late 60s early 70s. Without the year I don't know what manuals to purchase I know I will need the parts book and repair manual. If anyone can help. It looks like the model is a 40535M.