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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 instead of choke, instant torque clutch, 3 spring exhaust joint, 80s wiring harness with tether kill switch.

On a trial run in the back 40 last week, it pulled the skis 6-8" off the ground with crappy carbs, rebuild kits are on the way.
 
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