Sal, Don't waste your time with autocross in a Cobra, too much torque and 100 HP rice burners will clean your clock.
Lots of guys in the NY area attend these events every year.
Disregard the 2003 date, click on the event signup information, the forms for this year are posted.
http://www.smcrinc.org/glen_event_frame.htm.
Start right out on arguably the best road course in the country. This is a Ford friendly event but lots of other brands in attendance.
Many on this board have already signed up for this year.
Sign up early to get a garage which are free.
RD