Your car the GT, with the 4.6 2v would fit into G, H, or I stick class.
Since there are no 2002 Fords in the Classification Guide, you would have to enter it as a 2001 or 2003 which is allowed as they apparently are the same vehicle / engine.
Use this link
http://www.classracerinfo.com/ register for free, use the drop down boxes get the classes/ weight breaks, indexes and NHRA specs for your application.. Best viewed on a PC or laptop .