According to Allan E. Brown's book "The History of the American Speedway, Past & Present" the Evansville Speedrome was a 1/5 mile dirt oval which ran from 1948-59. I didn't attend any races there but remember seeing Jack Kochman's Hell Drivers perform there in 1957. Most of the areas name drivers ran there in it's heyday. The Evansville Courier recently ran an item in the Sunday sports section which features results of sporting events from the past. An item mentioned that Don "Snooky" Bullock took the lead on lap three and led the rest of they way in the 25 lap feature. I don't know what he was racing, but Snooky was a leading driver in Dan Tucker's sprint car #76 at Haubstadt in the '60's. Don Nordhorn raced at the Speedrome too. I believe the track was paved and used as a go kart track for a few years in the '60's after Haubstadt opened in 1957.
Pride Speedway or Pride Brothers Speedway is listed in the same book as a half-mile dirt oval in the late 1920's. I found an item about Duke Nalon racing at the Pride Brothers speedway on the internet. I'll try to see if I can provide a link.
I know Dan Tucker, but I haven't talked to him for a long time. He could probably fill us in as could Don Nordhorn.
I believe midgets may have run at the Speedrome fairly regularly.
Sorry I can't be of more help.
By the way, the Speedrome was located where Rafferty's is today.