Looks like a blast Yoop, nothing beats those old machines. I know a guy who races those old sleds, and one of my buddys is restoring a pretty rare John Deere 340 factory race sled, I guess the little 340 really scoots.
I am actually picking up a '70s (not sure the exact year) Roloflex 400 either Friday or Saturday to ride in a vintage snowmobile derby on the 19th, your only aloud 1980 and older sleds. My buddy will be on his 1979 Skidoo 370.