Have you decided on a rear suspension yet?
Ill toss in my vote for a torque arm. I've driven them on track and they hook extremely well. Using a torque arm with watts on my track car build. I had the benefit of driving my exact rear suspension on another car. Was after I had purchased it, but it was positive reinforcement.
Pragmatist mentioned truck arms, other than being a little dated they certainly do work. Being so long, I don't think wheel hop is even a possibility. Hotrods to Hell makes a truck arm kit for your camaro that I've seen perform well on a similar car (68 Cougar) on track.
Something to think about is packaging; exhaust mainly. Not sure if you want to run your exhaust out the back but certain setups will make it more difficult. Truck arms in general, I think would be more difficult, but have never built one myself. A torque arm crossmember is something to contend with, and of the two lateral locating devices (panhard or watts), the panhard tends to be less difficult. I've run dual exhaust on both but I remember the panhard bar being a little less challenging
Never have been a big fan of a canted 4-link, though exhaust routing is probably the easiest. You're asking a lot of your upper links. Not only do they have to control axle wrap, the also have to control lateral location. The G-link is far better than any factory bushing car in the respect since it doesn't have rubber bushings, but its still a compromise in my opinion.
A torque arm divides the responsibilities of everything. Torque arm for axle wrap (also have really good anti-squat if done correctly), lower control arms for linear forces, and a watts or panhard rod for lateral location of the rear axle. The torque arm height usually isn't adjustable due to packaging, but they're kinda set it and forget it.
As for the parallel 4-link or quadralink, I've never driven one myself, but as others have mentioned I've heard good things. Kinda costly.
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Ryan
69 Cougar
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