I have the 1990 447 Safari. IT's been a good sled. I mean the thing is 15 years old. I've had to do minor things like carbs, brake pads, idler wheels, throttle cable, steering linkage, but these are just all routine things. Without a rebuild I still have around 125PSI compression on both cylinders with about 10,000km on it. I can get the thing up to about 110km/h and I'm about 240lbs so really not a bad sled.
I"m sure you'll have fun. From what I hear the 377's are bulletproof. A lot of places up north still use them as rental sleds.