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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When? ASAP
Worth it? Absolutely yes..
Super stiff? No, that would be the shocks.
Undriveable? No, the new springs and slanty bars will make it almost undriveable.
For 360s? Yes, even with an aluminum top end, and the battery moved to the trunk.

The long rear end overhang makes Swingers notoriously fishtail/ accidental 180* prone. And you can't put enough sideways rubber in the factory tubs to help you with that.
For street; about all you can do with that 110"wb pendulum is to; tune the front;don't go into the turns too hot;get a manual shift which won't downshift on you in mid-turn;and get a DP carb so you can control the dang rear wheel speed, which will help control the powerslide. The rest is on your experience.