2nd gens have a wide A arm mounting to the frame. So it takes more shims to generate much positive caster. I doubt you could get more than 2 or 3 degrees positive caster.
Ride height affects how much you can get, lower = a little more, plus if you have more neg camber set, then there are more front bolt shims available to remove to increase positive caster. Once you have removed all the front bolt shims, that's it.
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