Sway bar/disc swap early a

Correct, just unbolt the ball joint from the spindle and swap the spindles side to side along with the calipers (if you don't swap the calipers the bleeder will be on the bottom and you won't be able to bleed the brakes.

The reason you need to do this is on the 72 an older cars the sway bar mounts to the lca outboard of the strut rod and with the caliper forward it can hit the sway bar when the wheel is turned in. The 73+ cars had the sway bar routed through the k-member and mounted inboard of the strut rod.