72 Dart Torsion bar replacements??

MopaR&D said

In theory if your current ride height is where you wanted it and you knew your current alignment was good you could just measure from the ground to a spot on the k-frame or fender and adjust to that point with the new bars. When was the last time it was aligned, and what kind of specs did you go for?

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Exactly! If you maintain the current ride height the alignment should be the same.

But, what’s your current alignment? And if your suspension has never been rebuilt, this is the best time to replace anything else that needs to be replaced. If the torsion bars are old and saggy, everything else may be too.