Paul,
My uncle's Dart was definitely out of commission at the end of '69 due to a blown engine, like I mentioned earlier. But, according to my uncle, that was AFTER Indy, not before.
Steve,
I'm not saying those pictures AREN'T at Indy, but I personally can't identify them as being at Indy, nor can I positively identify that as my uncle behind the wheel. That said, if you'd like to do a high-resolution scan of that image and send it to me, I can tell you for sure whether it is my uncle driving (though unless there is some signage that definitively identifies the locale as Indy, I won't be able to help out in that department as I never saw Indy personally until about 2000).
PM me if you'd rather e-mail me a high resolution scan than post it here.
If nothing else, it will be fun to bust on my uncle about his memory failing!