Help with the K member!

The two K frames are a direct interchange

The one you are putting IN is?? a V8?? K?? It should be, that is should NOT be a /6 K frame or you have gained nothing

All front end parts off either car---if they are both disk brakes, will interchange

If one is drum, and you are converting to disc, you need the "disc" parts from one car:

the upper A arms

The spindles and upper and lower ball joints, and of course calipers, etc

As ^^ above, you need to tear it all apart, anyway, because you need to replace all bushings and moveable / wear parts in the front end, unless the "donor" is fairly newly built.