If I were going to tap the spindles, I'd find some old stock Moog or TRW ball joints and use those. I'd do that anyway rather than use the likely Chinese ball joints included in the kit. Grease them every oil change with a quality EP grease, and they'll last.
I've purchased from these folks before. If you click on the "Add to Watchlist" button, they'll probably send you a discount code. As you can see, these ball joints are beefy. Just my $.02.
