We extend to you a cordial "WELCOME ABOARD !" Come on in, make yourself at home, we are a friendly group of enthusiasts, and we also appreciate the classic Chris Craft Roamer, Corsair, and Lancer boats too , as they are all on the same family tree and share much in common !
The hull number code description that Gary gave is accurate but I think there is one correction. The first year of production of the Sports Express (i.e. the FSA model) was 1967 and this is the "0" year. I have a 1967 Sports Express with the hull number FSA31-0031. So I think your boat with the hull number FSA 31-3042 would actually be a 1970 (3rd year) production model.