Longer offset shackles?

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i have a pair of SS springs on it now probably 30/40 years old. Seems to not have much of an arch, I’d like to raise it about an inch. Shackles are almost straight up and down. 28” drag radials on it

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I would honestly run air shocks before long shackles.....and I'm not a fan of air shocks. But if new springs aren't in the picture......