Re: 1960 evinrude 75hp
The spark plug wire assemblies are part number 580263 (takes 4). Get them from an Evinrude dealer. OR iboats has a kit to make them up. I always reccommend iboats for parts, however this kit requires a special tool to correctly crimp the screw terminals on the wires. You are better off getting the assemblies, already made.
No, they are not the same as a 1970. EDIT: I take that back. They are similar to the 1970, different lengths. Without side by side comparison, I can't say how the length is going to match up.