Tom;
Are you using the "Drop em Stop em" Granada Spindles? If so, we can assume the spindles were reamed correctly and the taper should be good. I have this set up on my '56. Are you sure you have the seal, retainer dust cap and cover on the ball joint in the correct sequence? Is everything greased well? That's about all I can think of for you to check.
Rono.
Ron Lane, Meridian, ID