Collectible Automobile February 2019 issue
 

Collectible Automobile has a nice article about the 1985-90 IROC-Z in the current issue, February 2019.
collectibleautomobile.com
They typically do a very thorough job of reviewing a certain make/model & this article is no exception: 10 pages and lots of pictures

Also in the same issue is an article on Zora Arkus-Duntov. The artice is mostly about his involvement with the Corvette (of course) but there's a picture of him in front of a 1967 Indy pace car, for you 1st gen fans.

Re: Collectible Automobile February 2019 issue
 

Perfect timing....Love for the IROC's and the 67 IPC too. I own car #23 that was issued to Michael Landon who was then staring in the TV show Bonanza as "Lil Hoss".