Hi William, I haven't been autocrossing for a few years, but I doubt the basics have changed much. They call it stock class because little can be changed. Basically the only changes allowed in stock class are: any shock as long as it attached the same, any wheel the same as factory size, any DOT tire, any catback exhaust, any front sway-bar and bushing, any air filter, any alignment, and spare tire, pump, and floor mats can be removed. Your biggest goal for a while is to learn to drive the car on course - seat time! The driver is the biggest variable in stock classes. The SCCA handbook is available on line at:
http://www.scca.com/contentpage.aspx?content=61 The good news is that 968's with M030 at one time were the hot ride in 'B' stock and I think they can still be competative - certainly enough to have a lot of fun.
I you want to see some interesting racing, Labor Day weekend is the Columbia River Classic vintage races and All British Field meet at PIR. I'll be there in a 1969 Lotus formula ford #18. This race is also part of the Foumula 5000 national tour and they have special races for them. See the fastest cars built in the 60's and 70's. more information at:
http://www.sovren.org/. The paddock is open so come by and say hi.
Cheers,