Mike, here is a link to the rules for the new Stock/Super Stock Class for this year. As your car is naturally-aspirated, there should no issues for you being able to race at an NMCA/NMRA event.
If you need more information concerning NMCA membership or using your NHRA/IHRA permanent number in competition, you should call Jamie Fasbender @ (714) 444-2426 ext. 118. She can get you signed up and answer all of your questions!
Good Luck at Norwalk!!
http://www.nmcadigital.com/dl/rules/sssc.pdf