The casting and history of use (abuse) of 30+ year old parts can vary a lot. My car has a factory drive shaft yoke, and it is holding up, things just break. Now, my car is a pure footbrake racer, trans breaks will "break" things with less power...

1993 Daytona, 5.50 at 130mph (1/8) 1.19 sixty ft (PG). Link to 572 B1 - Part 1