Our snowmobile club has one that the 1.6 must have died, was repowered with a chevette 4 and hydramatic. It pulls a 7 foot by 16 foot drag ( heavier than a dead cow) up unbelievable hills, and the 1.6 with manual trans we have can't keep up with it towing nothing. Now I'm not a GM guy, but I have seen this firsthand, and I have to believe it is because of the torque multiplication available with the AT convertor. The 4 speed 1.6 can't hold a candle to it. If you could find a C3, I would be inclined to try it. Thinking of repowering our 1.6, or selling outright.