Proturing or roadrace rear suspension

You mean, this one? On the Gurney AAR.

Yes. Also, for anyone thinking about doing using a panhard, it is important to do the shackles like they did (to allow a little side to side movement). I think I have a photo of that if you want - PM or e-mail me and I'll send it to you. Slightly ironic that IIRC it was the Challengers that used that used a panhard setup for the full '70 season. Tony A2Z mentions that on his website (He drove a couple of races toward the end of that season).

PS. I like your 'rules' emicon