There is quite a bit of documentation in Fehrenbacher's book about the Curtis dissent and the quarrel between Curtis and Taney that resulted from Taney's rewrite of the decision after it had been delivered. Taney's imperious attitude and political machinations was some of the reason Curtis left the Court. There is even a passing mention, as posted, about Curtis's eulogy for Taney.
However, the book was about the Dred Scott Case, hence the title, and not about the relationship between two justices of the Supreme Court.
There are, in fact, several references to the Curtis's A Memoir of Benjamin Robbins Curtis, LL.D., Boston, 1879) and Curtis's private papers (Benjamin R. Curtis Papers, MDLC).
I can see you haven't read the book. I will suggest that before you comment on the level of Prof. Fehrenbacher's scholarship, you at least check the book out of the library and pretend to look at it.
...in which case it is only proper to mention that Curtis was openly forgiving towards Taney over their dispute and the decision.