Your #1 constraint will be using standard springs. Run 12" travel shocks unless you want to unload the springs. And as for arm length vs. travel, a "stock" length arm (let's say 17" lowers) can fully utilize 12" travel shocks IF the suspension is setup correctly and you're using appropriate springs. Your most ideal situation is to have the arms as flat as possible at ride height, aka your axle as far back as it's going to travel throughout the suspension cycle at ride height. The more angle you've got at ride height, the more jacking you'll experience during droop. At about 2.5-3" over stock my lowers (17") are at about stock angle (2-3*) at ride height....all with superior clearance and geometry. At full droop with 10" travel shocks, the axle is still visually centered in the wheel well while it's slightly back of center at ride height. I'm also using Poly frame brackets but did it a bit differently in order to retain the best possible clearance, well-knowing that longer arms wouldn't do one thing for me except decrease clearance.
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