Problems Re-Installing Front Wheel Hub

[all_american_c10]

I just located and bought back my grandfather's old '67 C10. He bought it new, my Dad learned to drive in it, and it was my first truck until I sold it to my cousin when I joined the Army back in "95. She's in pretty rough shape. I decided the first order of business would be a brake job all the way around.

Starting on the passenger side front, I'm replacing all brake components (including the drums) as well as the inner and outer bearings and races, the seal and the dust cap.

As I went to reinstall the hub, I can't get the castle nut to screw onto the spindle far enough to expose the hole for the cotter pin. I've checked to insure the races are fully seated (they are) and that I have the correct bearings and races (according to O'Reilly's and the inter webs, I do). Something is obviously afoul. The only thing I see that makes me a little curious is that even when fully seated agains the outer edge of the inner bearing race, the seal protrudes from the hub about a 1/16 - 1/8". Can't remember if the old one was flush or not.

Any ideas? Seems like it has to be something obvious that I'm missing. Frustrating for such a simple job to be causing such a problem.