Different midsection because of different trim system. I believe even the shift is backwards if I remember right? So no it won’t work. Now 25" 1977 85 & 115 hp V-4s went to the new mid section a year earlier and would work, but are the newer style gearcase. Hope that doesn’t confuse you? It does everybody else. Be sure & look at the parts books. It was because of the all new 1977 140hp model that picked up the new parts.
Dan in TN