I have a Seafarer 29' and sail out of St. Simons Island, GA. I've followed the various Seafarer groups on the internet for over 10 years. At one time the original Sailnet group was very active, but not so much since the email system was eliminated. You've already received some good information Seafarer Research Center
Also, I am the administrator of the Seafarer Yacht group on Facebook. I started the group about a year ago to see if I could reach more Seafarer owners who preferred the social network web sites for move interaction. I think we have about 50 members so far.
I have also made a point of saving every document or old Seafarer advertisement I could locate. I have these in pdf format and can email to you if you're interested. Frankly, they are fairly generic, but there is some information that is helpful.
Welcome aboard as a Seafarer owner. They boats are well built and very reliable. With a little TLC & $$ you should enjoy many good years of sailing.