When should you upgrade torsion bars?

Joshua Suehs said

IM upgrading my rear springs to Espo’s 6peaf +1’s and I have been reading a lot of the guys that go with 1” torsion bars. Is that only for big blocks or is that wise for a guy like me who has a build 360? 73 dart swinger... let me know what your thoughts are. Wondering if it is worth it to upgrade while I’m doing the rears or if it will just make it super stiff and undrivable.

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My question to you is was the car a slant /6 to start with?
If you liked the ride of the /6 then you swung in a small block, upgrading the bars to 340 bars would keep the ride quality the same or at least very close.

If it was a V8 car to start with and you thought the up and down movement was lacking, then a 1 step up thicker bar would be your answer.

The T bars largely are responsible for up and down motion.