Upper Control Arms ??

The upper control arms will need to be changed to a 73 and up disk brake ones with the larger upper ball joint. And while you are at it grab the spindles from the same a-body car. I use the fmj spindles on my duster circle track car to lower the roll center and improve the camber change curve but I had to change the mounting angle of the upper balljoint to keep the ball joint from bottoming out in its socket. So if you drive your car agressivelly you may run into problems with the taller spindle.