1977 904 horsepower limits?

Well that's an extremely loaded question. What would a freshly rebuilt 1977 tranny hold? What would a 1977 tranny that has 60,000 miles that's at all its life? That was used periodically? That had the fluids changed regularly? That had the bands adjusted all its life properly? And the big one the pressure sensor was it adjusted correctly all its life and is it now?
The 904 seems to be the drag racers choice, so I wouldn't see one of these having any problem holding horsepower.