I have restored many and currently own a number of Standard GoldWings. I have a rarer 1984 GL1200 Standard that is a two owner bike that I have owned for 12 years. It is my favorite long distance ride with the Corbin seat. They built less than 5000 units of the GL1200 Standards world wide, as everyone buying a Wing at that time gravitated to the Interstate and Aspencade models.
I think I suggested the Honda Moly paste from a Honda dealer on the Naked Wings forum as an option, since it is 77% Moly and designed for the big Valkyries and other models that were eating their rear shaft splines. It is in a tube too and will do a number or Wings, plus it is much less than $70.00.
The early 75-77 models are quite fast, as they use a higher lift and duration cam set and different carburation than the later model 78-79 series, which were retuned more for low end and mileage. Much like the evolution of the CB750 motor over the years.
Here's the 76 that I restored and sold a few years back that was a combination of the Bicentennial model for the US market that had the special gold aluminum rims and more chrome bits around the bike. The motors were supposed to be a select "blueprinted and balanced" series for this special model, yet there are various yes and no thoughts there.