Thank you for your answers!

"I believe they raced at Jungle Park also. Another sprint car club of that era was KIRA, the Kentucky Indiana Racing Association."
Yes of course I didn't follow:Jungle Park...I've never heard KIRA,but very interested in...and thanks also your records.I'm doing a project right now.Trying to collect all (speed car/big car) events from 1919 to 50's years.It's also a good supplement for me!(If anyone has other big car information, please share it with me!)

"Do you know what track they ran on at Muncie?" Yes I know:it was Delaware County Fairgrounds half mile track!