Piecing together a few sources on line, it looks like that when Bob DelGiorno quit Mornings in 1976, Dave Baum moved from the Contact 10-Midnight Talk Show to Mornings, and Clark Weber moved from Weekends to the Contact 10-Midnight position.
WIND Lineup at the end of 1975.
Bob Del Giorno 5:30-10 am
Chuck Benson 10 am-2 pm
Stu Collins 2-6 pm
Connie Szerszen 6-10 pm
Dave Baum "Contact" 10 pm - Midnight
Ed "Chicago" Schwartz Midnight-5:30 am
Howard Miller Weekends 9pm-Midnight
Gary Gears Weekends
Joel Sebastian Weekends
Clark Weber Weekends
WIND Lineup at the end of 1976.
http://las-solanas.com/surveys/WIND/WIND_1976-00-00_1.jpg
Dave Baum spent a year or two at KMOX around 1977-78, then came back to WIND.