Need front suspension guidance

I'm restoring a 1973 Dart. 225 slant. 80K miles. It's been in storage for many years. I've removed the lower control arms and everything associated with them. I'm certainly going to replace the lower control arm bushings but should I replace everything with new parts while I have it all apart? My Aunt originally owned this car and she was the epitome of the careful driver, meaning ball joints and tie rod ends still look to be good. No broken grease seals. Or should I go ahead splurge on a P-S-T kit and replace all (or is RockAuto stuff okay)?
Now a question about upper control arms. How can I test them to determine if the bushings are okay? Or again, should I just go ahead and replace them? After all, they are 50 years old. Thanks.