if you know the boat name and it's doc'd you can look that up online from the USCG database at http://www.st.nmfs.gov/st1/CoastGuard/VesselByName.html if you dont' know the name of the boat, try finding one on yacht world and look it up...
hard to tell... they are large enough to be documented so why not? if you search for Hatteras on boatinfoworld, a 1963 33 footer comes up on the first page... 13 NT, 16 GT, 12.3 beam The brochure for the 34 Sedan of that vintage shows a draft of 3' http://www.hatterasowners.com/models.htm