Hemi Harvester -- As Autoxcuda said, get to some events and mingle, read the rule books, etc..also... there;'s some good vintage magazines on the market.
Up in the Chicago area, you may want to hook up with Brian Garcia (aka "roadracecuda" here on Moparts)... he runs his 67 BCuda fastback Gurney-ized car in "Vintage Historic" GT-1/TransAm class through the Midwest Council of Sports Car Clubs...
www.mcscc.org He will probably run the wknd of Oct 4/5, 2014, at the Joliet Autobahn... see my current post offering a Mopar get-together there for HSAX and W2W racing. Plan to come if you can!