upper control arm hitting spindle

[Tukn22z]

well im installing a mcgaudys disc brake kit with 2 1/2 drop spindles on a 1970 c10. The problem i am having is my upper control arm is hitting the top of the drop spindle. I've read people saying trim the upper control arm a little so it doesnt interfere but i feel like the upper ball joint isnt seating correctly in the spindle. Now i measured the widest part of the taper on the ball joint and it was around .708". I measured the widest part of the taper on the spindle and it was around .735". does this sound correct?

The ball joints im using are MOOG Part # K6024

These are the spindles :

http://www.summitracing.com/parts/mm...del/c10-pickup


heres some pics of the issue