You may need to re-adjust your corner weights as a result of flipping the plates and re-setting your camber. This would be required if you cannot keep the ride height identical when you re-adjust.
If I recall correctly, you have to switch the plates left to right and vice versa.
Those sway bar mounting parts you show may not work as well as the factory camber eccentric. In my opinion, that million-year-old design works well especially if you lock things in place properly.
Cary E. does not normally deal directly with public or provide detailed documentation. My friends at JWE/SRP created a lot of documentation for their parts and many of the parts they sold, like the ERP spring plates. The late Gary Walton was a key contributor, and I have most of the documentation as it was available on CD Rom and either Gary or El CW (founder and owner of SRP) gave me a copy years ago.
I recommend checking the chassis area where the spring plates attach for cracks-- they can be quite common.
My '75 had them. I discovered them in ~2015 during a suspension update/refresh. I have owned the car since 2001 and never noticed them before. Glad I checked.
If you prefer not to fab, Elephant Racing Products has an excellent reinforcement kit for these chassis areas. Welding required.
From Club Race event at LS in 2002... if I recall correctly this was a paid spectator event. Car has had a few changes since then... for example I now run custom carbon fiber headlight covers instead of 993 headlights when on track. I swap in the lights for street driving.
