Thanks for posting this. My cousin and I went today and it was a lot of fun watching some old cars run around IRP. There were a couple of Harry Miller cars and several roadsters running and the IMS Museum had these:
The Museum's Restoration Team will run the 1950 Wyn's Friction Proofing Special Kurtis and 1955 John Zink Kurtis roadster in various on-track exhibition sessions throughout both days. In addition to the cars running, we will also have a static display of the following vehicles:

1919 Sunbeam
1922 Bentley
1962 Thompson Harvey Aluminum Special
1958 Dowgard Kuzma
1974 Jose Johnson Special Eagle