One way, but it is laborious/time consuming as hell, is to go to each individual IHSAA yearbook prior to 2002. Each year contains all sports and for wrestling you can see individual results by sectionals, etc. Here’s generic link for a location for IHSAA yearbooks.
http://www.ihsaa.org/dnn/Resources/IHSAAYearbooksHandbooks/tabid/2087/Default.aspx
And for 1975 as an example (wrestling starts on page 241 of 498):
http://www.ihsaa.org/Portals/0/ihsaa/documents/Yearbooks & Handbooks/1974-75_IHSAA.pdf
Did I say it was laborious as hell… Definitely not a quick answer.