I wouldn't *not* trust Herb Adams but suspension parts have changed a bit since the 70's and each platform reacts differently. His statement was "g-bodies with rear swaybars push like dump trucks". The friend who autocrossed his SS is pretty well involved with autocrossing, you might even be familiar with him if you are into that scene as well. Doesn't mean he knows everything and it's all about parts working together, for someone a big rear bar might help greatly while the other car and totally different parts does not. I also recall Mark from SC&C stating something that a rear bar isn't always necessary, depending. I didn't run one on my SS for probably 10+ years, stuck a stock g-body one on with the last set of new LCA's, was planning on a Ridetech bar but re-thinking that.
Here is the link Cory sent me of his issue at the time (Lance Hamiltons SS):