Found this for sale. I had a Foremost "Sure Go" once. Mine had a 6 cyl Ford, but has the same drive system.
http://alberta.kijiji.ca/c-cars-veh...s-snowmobiles-1970-Snowcat-W0QQAdIdZ547842718
http://alberta.kijiji.ca/c-cars-veh...s-snowmobiles-1970-Snowcat-W0QQAdIdZ547842718