Check out Chicago Sun-Times columnist Robert Feder's memories of Summer of '87. Some really good tidbits about Larry Lujack and John Gehron, both leaving WLS that year.
Speaking of The Big 89, I just received my four books on Chicago's Top 40 Charts by Ron Smith. Three cover the periods of 1960-69, 1970-79, and 1980-90 on 'LS and the last one is Super CFL 1965-1976. I plan to use these charts for future shows.
I've also got a tribute to Uncle Lar in the works. Keep listening for that special production.