Anyone ever break a SBJ spindle at the upper BJ taper?

I don't see it as a issue.

I've seen plenty of bent 1/2" taller ball joint shanks when I crewed circle track racing. Many times the tubular A-arm bent or snapped before the pin completely broke. Actually I can recall a broken pin. But plenty of bent and broken UCA and LCA's ! Bent front clips, etc etc.

Are you committed to Small Bolt pattern brakes and/or rims financially or something ?
It's an H code car, I have the factory wheels as well as a set of centerlines and all of this stuff functions well. Financially I'm not loaded and I'm not hurting either, I don't want to be so I try and make do. I know I won't be competitive in cone killer events, but it will have to be better than it was with 225-65-15 bfg ecentia gt tires and the 275-65-15 bfg drag T/As oh and that was with a 24:1 steering box and I had a blast with that set up. Finished second out of 9 newbies and lost to a new Mustang by two seconds. the other cars were a mix of newer daily drivers.
AND now I'm going to say it, and I hate to admit it, but I want the easy button, I'm tired of the fight to get what I pay for and often end up disappointed with some products even when there isn't a problem with supply or the products reliability. Maybe I'm just impatient to drive it after twenty years, I don't know.