Vintage
Been messing with a 74 TNT F/A 400 this summer, its a little over half finished. It now runs a 503 fanner from a Blizzard 5500... Here are some pics.
http://www.snowmobilefanatics.com/forums/members/42575-albums7106.html
Sled has numerous upgrades now, 100cc over stock, mikuni carbs, primer...