Clark gave some good info for road racing near you. I know Dart Kart Club/AKRA gets together with CES to do Mid Ohio and Grattan. And they have 25-40 shifters show up for those races. And than both clubs have other races that get 15+ at there other events. They have stock honda classes too but those have smaller class sizes. The DKC/AKRA series also races with MKC that has 2 races at MIS which isn’t to far from you.
If you’re looking for a kart I’m just about to post my 2011 Zanardi/TM k9b for sale. Email me at firstname.lastname@example.org if you’re interested. If not hope you find a good kart and have great time racing shifters.