If you're running a sidewinder Linton, Logansport or Peru are your options.
If you want to do upright racing, the Midwest Mini Sprint Association runs at tracks in south central Indiana. They run on the same tracks as sprint cars, modifieds, late models...etc. Check them out at
www.midwestminisprints.com
As far as engine, they're all essentially motorcycle engines. Sidewinders use 600cc engines while uprights go up to 1000cc. You can put a 600cc in an upright, but no tracks in Indiana run 1000cc sidewinders.