Johan, your car is one of my favorites here on PP.
My 82 coupe came with a strut brace I have always though is a bad idea because it acts directly on the struts, or at least on the rubber of the upper strut mounts. I don’t know if these were commonplace at one point, but you **can** really crank in more leverage on the tops of the struts with it, i.e., in the direction of positive camber. I have since installed a conventional bar that braces the unibody. It might get you the results you want but maybe you too wouldn’t like the idea of this lateral force applied against the struts themselves. Best, John in CT