Dual point rotors have always been hit or miss, even in the old days, out of 10 you might get 2 that fit right. I have an original nos rotor I bought in the 70s that is so loose it falls off the shaft, and another from advance-BWD from1992 that is so tight you can hardly get it on. It appears at this point there are 2 styles made, neither better than the other. Check them after they get hot too. On u-joints you should only use Spicer like most driveline shops, Tony is right on the c-clips, in fact one brand of joints in the 70s and 80s all used the thicker clips, Ford or Mopar. Most people and shops could not install a u-joint right if their life depended on it, but that is another looong story.