To go back to any kind of leaf spring, you need to have leaf spring perches that are welded directly to the axle housing. Your floating housing setup requires some kind of torque arm or linkage to prevent the rear axle from flipping over.
Is your car handling badly with the current setup? I've seen cars with similar linkage and they aren't all that bad, not the ideal for autocrossing, but not bad on the street. The main effect is some corner entry oversteer and corner exit understeer. Once you apply power, the car wants to go straight, steering does not respond so well.
What are your goals for the car as far as handling? Street cruising, or track and autocross? Are you going to minitub the car and run 18" rims?
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