Re: 1979 swiftsure
Welcome Aboard:
You're probably going to have a hard time finding that kinda' technical information on the hull. Boat companies didn't/don't really publish that kinda' stuff. I'm assuming Swiftsure is outta' business at this point, BUT you can try digging up company information via the HIN (if the boat has one - note sure if they're required up in Canada). Check on the stern, just below the rub rail (or on the capacity plate) for a number. The letter designation at the beginning will be the MIC code for the manufacturer. That may help dig up a lead.
If you have specific questions you may want to post them and see what answers you can get here. May be faster than trying to go the "Sherlock Holmes" route with the drawings you're lookin' for.