I built engines for a racer who posts on here.....Ed Bigley....
He had a '68 Chevelle and it had Alf Wiebe rear suspension.....
http://classracer.com/classforum/alb...pictureid=5258
The car went in the 9's on a small tire. It did big wheelstands on every pass on a decent starting line and there was no twisting of the front end.....
I looked at the Wiebe bars and they are very trick.......I am not sure if he still makes and sells them though....