1/4" won't do much in the way of caster. I'd just do the regular Guldstrand mod. The GW upper A arm has nearly 1" of relocation. I think one shim would make the difference so not a big deal.
Some guys have other clearance problems between the arm and frame mount, you might verify clearance before doing the mod. Leaving out the rear setback would cause less clearance issues.
David
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