Auto-X / Roadrace rear suspension 1969 Valiant

I'm by no means a guru on suspension, but I have ready that many people are using torque arm style. (I know you mentioned it above.) Here's my opinion, which is worth nothing. You started by saying you wanted lots of adjustability, but it appears the 3 link won't give you that. So why spend the money on it? Art Morrison makes a torque arm setup that looks like it could be easily adapted to an A-body with some amount of fabrication. The adjustment seems endless on that thing. As with all things in the automotive industry, it comes down to how much money you want to spend. A set of leaf springs will get you on the track right away instead of waiting for the car to come out of fab shop jail.