For the winter, at my local track we run a spec class. Box stock TT-01, under $50 speedo, stick 3300's unmatched, rubber tire, 540 motor. All of the racing is within second of each other. However, the cool part about this is that you must run a body dating pre-1972. Currently there are a handfull of Impalas and Mustangs running. While it is not a requirement, most are painted and stickered as if from that era. They are very cool looking. Aside, from the spec nature of the class, the body is what drew my attention.