We are working on a 95% bolt-in rear canted 4-bar for the 1st gen Camaros as well. We have finished the Mustang/Cougar application, and the Camaro is next. This is the Ford Piece, the Gm will be very similar.
http://www.totalcontrolproducts.com/gbar.html
Chris says March-ish.....
Adjustable ride height, shock angle, 3 kinds of arms, 2 kinds of sway bars, etc. very cool stuff!
Tim