davek, I apologize if I implied you were endorsing the modification. That wasn't my intention. This was more than 20 years ago but I recall the Adler's telling me it was impossible to make the modification work. It was a good idea but very poorly executed. Since the new mounts were welded to the chassis, removing them was a major undertaking and not done without much thought and discussions with more than one race car chassis builder.
The only feedback I've heard re: the RB suspension was that the hydraulic power steering was horrible. The road tester drove the RB Pantera and a stock '74 GTS back-to-back. He said the '74 GTS was nicer to drive, probably due to the fact the RB Pantera had never been properly sorted.
Someone on this forum called the Roadster Shop and asked the price for the RB suspension. If I recall, it was around $30,000. That's certainly much less than the six figures the chassis costs!