Early-A Large Bolt conversion question

I currently have everything to covert my 66 Dart to the large bolt pattern on the front and back. I do have a question though. For the front I have the upper control arm, spindle, and all brake hardware.
Although I am curious if I need to run the Early-A style lower ball joints or do I run the later 73+ style lower ball joint. I think they are both like lower control arm style since they all come in one unit, but I do notice they have different part numbers for the early-A's. Sorry if it is a dumb question. I just want to make sure I get everything together before I start pulling things apart.

Thanks again guys!