How do I remove lower control arm on a 67 barracuda

The strut rod wasn't mentioned above. Must unbolt that too. Lower arm is easier said than done for sure. In some cases, assembly hanging way down, it will be impossible to get a tool on the lower ball joint nut.
You might need to remove the bump stop at upper arm and lower the assembly a little further to fully unload the torsion bar too. So to unbolt the lower ball joint from the steering knuckle might be the better route. Some of those are threaded into the knuckle ( the simpler, we'll hope that is yours), Others are bolted clear through ( need to hold the bolt head at brake side of those ). If I can take lower arm with lower ball joint to the workbench and separate there, I will.
Good luck any way you go at it.