Re: selectric shift
Evinrude used the Triumph name for the 3-cylinder looper motors from the 1968 55 horse through the 1974 70 horse. Those motors existed the first 2 years as 55 horses, the next 2 years (1970-71) as 60 horses, the next 2 years (72-73) as 65 horses. 1974 was the last year Evinrude used names for each their motors. 1974 also happened to be the year they took the triple up to 70 horses, so a Triumph 70 could only be a 1974 model (or perhaps it is a 74 cowl on an older or newer triple). Model numbers would be helpful here.
The shift mechanism changed from the Hydro-electric shift to Power Pilot control with hydraulically assisted mechanical shift on the 1973 models; similarly the self-contained, motor mounted tilt pin steering was introduced that same year (on the long 20" shaft only) replacing the Teleflex steering that needed to be anchored on the transom.