There is a short obit in the Louisville Courier Journal Archives but it costs $7.95 for a subscription to be able to see it. Here is the link if you want.http://courier-journal.newspapers.com/search/#query=Carlos+B...
You can scroll around with the arrows and see most of it without subscribing. Carlos Bunnell, Age 78. Says he was from Bunnell's Crossing. It mentions Sego Funeral home in Munfordville and it looks like it is still in operation. Perhaps they have an extended obituary on file. Survived by his widow and William Paul Bunnell, Louisville. Funeral was at Green's Chapel Church of Christ. That is what I saw by scrolling around and I think that is the gist of the whole publication.
Friday, April 8, 1966 - Page 42 and Friday April 8, 1966-page 12 depending on which version you received.
Or you might contact the Hart county Public Library and see if they had a local newspaper at that time that may have published it.