Small question about disc brake swaps

Yes/no
1972 and earlier you can get sbp A body disk brakes (4 piston calipers) that would go with the small ball joint upper control arm. 1973 and later A body uses the large ball joint and lbp disks. While you can physically bolt in the B/E body stuff, the knuckles are a slightly different height. I've heard people go both ways saying it's not enough to make a difference, and other people claiming you'll never be able to properly align your front end. Do your own research to see what's best or just be safe and stick to the A body 73 and later parts.
Option 2 would be to go to Dr Diff and just skip all the confusion and buy it all in one place.