welcome to the club of trying to preserve all things mechanical.
I've been the proud owner of one Norton or another since 1972 (with a couple of Hondas sprinkled in here and there). Currently have a 1975 Norton Commando - MKIII Roadster model (I'm the 2nd owner, mine since 1978).
Try out the site below (N.E. Florida BMW owner's club). There are undoubtedly national and international clubs to join as well. I'm a member of the International Norton Owner's Association (INOA) and find the people as friendly as those on this site (but they don't have as good a forum - they're still stuck on Yahoo). Best of luck, and I hope you enjoy your riding time.
http://members.aol.com/bmwnef/