You have to be involved too. It's tough doing this without seeing the car in person. One thing at a time. And you have found things. Just keep going.
Have you measured from the end of your centerlink to the frame with your steering box, pitman, and idler arm in? You need to establish that your center link is in the right spot up and down.
But when you found the busted K-member and shot lower control arm bushing that's huge. I've broken one before too. The lower control arm moves all over the place. Have that welded up or replaced.
Did you check the other side yet?
In you picture of the steering box mount on the k-member, there looks to be a vertical scratch just above the lower control arm hole. Check if it's a scratch or crack.
Did you look behind the two inner steering box nuts to see if they are welded in good and don't have partial weld breaks. Tough to spot, but clean the inside good and look with a flashlight.
