BOY!!!!!!! When the first runs of the post 64 Model 94s came out they were awful. However, around serial numer 3,400,000 (1970-1971) things started to improve and shortly thereafter Winchester stopped using stamped parts, tightened tolerances and went to all machined parts. Right at serial number 5,200,000 things really got better as that is when the Angel Eject came out and all Model 94s were made of all steel parts.
If as you say, your friend's Model 94 was made in 1984 then I am pretty sure it is an Angle Eject. If so, it is all steel and really isn't too bad a rifle. I'd say if you cleaned it thoroughly and if the barrel is in good shape, your friend has a good serviceable hunting, plinking, etc. rifle that should last him for his lifetime.