I suggest you spend a few minutes looking at the BM rules. They only take up about 1.5 pages, starting on p.229 in the May 2013 version that I downloaded from the SCCA Website. There are a couple of key requirements:
1. Minimum wheelbase of 80"
2. Minimum weight tied to engine displacement with the lowest weight listed as 1020 lbs, including driver
If you still qualify or can or are willing to meet those two criteria, you should next look at the aero rules listed on p. 230 (Formula Atlantic rules with some additional allowances). After that, you should look at the Formula S rules in the GCR.
You might be too small and too light, but it won't hurt checking.
The car that won this year is basically a formula car with minimum bodywork and aero geared towards Solo. You would not find a car like this on a road course because it's been (at least partially) optimized for Solo competition. I am not sure if it came with a log book, but I believe it was homologated for road racing.