Place was really nice when it was pavement. Medium banked 1/3 or small 3/8. should be alot more multiple groove now that it is dirt. I would say it should be a great place, however it is a few miles north of Springfield MO.
Saw a pretty decent MARS show there last year, Billy Faust even showed up but had a little trouble. I liked the speed the LMs got down the straights, the track blackened up a bit but it wasn't choo-choo racing by any means. MARS usually has two shows a year there. Best bet for you if coming from Stl. is to come down 44 through springfield and head north a few miles on Hwy 13 north. As Dean said, it's a few miles north of Springfield, in other words, make a weekend out of it and visit the mega Bass Pro Store!!!
My grandma and uncle live nearby and say it is a lot of fun. Unfortunately, every time I go to visit, it is too late at night when I arrive to enjoy.... They claim to have some good shows though.