Re-arcing mopar SS leaf springs?

The only way you can truly re-arch a spring is if you have access to a spring shop that has a furnace. Many shops will simply use a big press to re-bend the spring but the re-bend won't last long under car because the springs were not heated (in a furnace) to the correct temperature for re-arching. So if you can find a shop with a furnace and they can do it for a reasonable price then the answer is yes!!
Once springs are re-arched in a furnace they should last as long as the original springs.

Treblig