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I believe that (and I could be wrong) if I make it too long, it will cause wheel hop on braking.
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Actually, it is the reverse. The shorter you make the arm, the higher your anti-squat value will be due to a shorter SVSA (essentially the same as the effective length of the torque arm = front pivot point to rear axle centerline). In this case, the car can show a relatively greater chance of brake hop. Making the torque arm as long as practically possible is best for the brake hop, but then you have two other issues (at least) to consider. One, your A/S value will go down, but that isn't a huge deal in and of itself. The bigger issue is structural rigidity of the arm itself, when it becomes longer, there is a greater tendancy for beaming flex (bending) under an equivalent load compared to a short arm. An A body is a big, heavy car, with a slightly longer wheelbase than a late model Mustang, so use a bit of caution when deriving a setup from the commercially available setups from Maximum Motorsports, or Grigg's. Torque arms are proven winners, but like you stated, the devil is in the design and tuning details.
Mark