Historical Death Index has been extended to 1988 in Victoria. Why not purchase his 1986 death certificate. You will need to search to find the registration number and then you can purchase online and download immediately.
http://www.bdm.vic.gov.au/home/family+history/search+your+fa...Headstone at Creswick
https://s3.amazonaws.com/bg.ami.com/headstones/images/201310...