Bill Reilly (RMS) did the calculations on the taller spindle. He liked everything about them. We did put them on my son's autocross Barracuda, but really I don't think he noticed a difference.
The information on BigBlockDart is the same as the article that was published in Mopar Muscle, that’s where it came from. And it was written by Bill Reilly of RMS. Same info from the same source, both sources are linked above already.