It looks like Harry Mendryk credits the whole kit and kaboodle to Kirby: http://kirbymuseum.org/blogs/simonandkirby/index.php?s=insanity&submit=Search
Not the whole book.
He doesn't credit (Simon and/or) Kirby with "Old Love" (6 pages), some but not all of which does look like MAYBE S&K.
Look at pg. 3 bottom left panel -- redhead looks like a Kirby woman -- etc.
Nor does he credit S &/or Kirby with "Dorothy and Digby" (4 pages) -- which has the initials "FO" in the splash panel.
Fred Ottenheimer is credited in GCD for art in an earlier From Here to Insanity.
Thanks for the comments, jrvandore, and the link to the Kirby index.
I love comics!
Bob
Public Enemy #1