I'd let the control arms go for another 75 with the balljoints in them, just beuase i know it's going to increase the shipping size. 66 is on the early side for my A body knowledge..i'd assume since swapping to the correct sized balljoints, and spindle, the rest of the setup would go on. But i can't say that with 100% certainty.
this is a Big bolt pattern also. if your car is drums in the front, petty sure you have the 4x5 on all 4 corners.