I'm collecting pictures on the web since 15 years. I hope some people here would have some other pics to share, but it appears to be difficult. So I'll share all the Indy SW's photos that I have. Here is 1963 now with some Chrysler SW's :
I never thought about wagons at the Indy or really any other races but the drag races and Bonnieville. I was missing out on some pretty neat pictures. Thank you for posting them.
According to some websites, there were five special Cadillac Deville SW's build for the 1969 Indy 500 too. But I haven't been able to find any pic. Maybe this one is one of those Cad's : http://www.rmauctions.com/lots/lot.cfm?lot_id=16914
So, the Camaro was the pace car for '67 and '69. Interesting. I remember seeing alot of '69's on the road with the pace car emblems, but not so much the '67.