djoyce93
Welcome to the forum.
Your 71 will run on unleaded but if you have a fiberglass tank I would choose Shell hi-Test only as they are the only fuel company that I know of that doesn't use ethanol additives to the gas as a % of 5-10. Ethanol will eat away at your glass tank and cause gumming in the fuel delivery system. If your tank is steel then you are ok on the lower grades of fuel.
I am not familiar to the Ottawa area for mechanics but if you get on Ontario Norton Owners website
http://www.ontarionortonowners.ca/
There is an Ottawa chapter that would steer you in the right direction. Also try Canadian Vintage Motorcycle Group. They have also chapters all across Canada.
http://www.cvmg.ca/Ottawa
Also you have found a great site here which will help you along the way
That will get you going.
Cheers.
CNN