Torsion bar removal

Beside heating the flat nut, try hitting the bolt with a hammer many times. Not hard enough to distort the threads. Your goal is to vibrate the penetrating oil into the threads and lubricate the rust. As oil gets in the threads, any motion from hammering acts like a hydraulic pump, generating tremendous pressure, which drives the oil in further.

As mentioned, if you can unload the T-bars, even without backing out the loading bolts, you will be able to slide the pivot bolt back and get the T-bar out. Don't give up on the car. If your LCA's are rusty junk, you could get new rust-free ones from CA or AZ, maybe even w/ sway bar brackets. Cheaper than trying to clean and paint pitted ones. If you disconnect the upper ball joint, there should be nothing left loading the T-bars. BTW, I am a Jax native (Sandalwood HS) and know corrosion. Glad to leave it mostly behind in NorCal.