SOOO many questions

The steering will be manual. The entire front is off the 73 Dart Sport so it has the larger control arms and disc brakes. I plan on rebuilding all wear components as they probably need it. The big worry is replacing the torsion cross member. I want to make sure it's in correct as I don't need to have things out of alignment before the fun really starts. Don't want a dog track!
Would the frame ties and torque boxes make it too rigid or more stable?