Drop spindles 67-72/73-87

[Tony71c10]

Im in the market to buy 2.5 drop spindles for my 71 front disc brake c10. Was reading that I can purchase the 73-87 (CP4S4) spindles and just change the upper/or Lower ballpoint. I also replacing my 1.25 rotors. I guess my question is what is the benefit of using the 73-87 spindle. I'm already plan on taking everything apart so if beneficial might as well do the spindle upgrade. Any recommendations ot info is already well appreciated. Thanks in advance.