E body Kelsey Hayes on an A body?

I have a set of KH E body spindles, brackets, calipers (4 piston) and lower ball joints. Can i use these on my 70 dart. I noticed that the width of the ball joint mounting holes are wider than the 74 valiant setup that i have. I would love to use the KH since it has much larger discs and 4 piston calipers, but dont know if i would have to change the ball joints. All help will be much appreciated.