How do I remove lower control arm on a 67 barracuda

there has to be many archived threads about this. And you'll find many members have different methods.
For me, I support the front end of the car on jackstands under the frame rails in the vicinity of the firewall. remove the tie rod end from the lower ball joint. Back off the torsion bar adjusting bolt until there is no tension on the adjuster at all. remove the nut and washer from the front of the LCA pivot stud. remove the cotter pin and castellated nut from lower ball joint ball stud, and remove the ball joint ball stud from LCA with a hammer or press tool, or picklefork. remove the wire clip from the rear of the torsion bar socket. insert a pry bar of some sort (crowbar will work), between the rear of K- member and front of LCA, and force the LCA rearward. This will push the torsion bar back out of the rear anchor. Once that has happened, continue to push the LCA rearward until the front of the pivot stud clears the hole in the rear of the K-member, and it's free.