Nothing has gone wrong so far, I love the 305 and it hasn't failed me.
The only thing that is wrong with it is that the power windows and door locks don't work, nothing major.
This is a great performance car and it handles like a dream.
It is common to have problems with power windows in most 80's and early 90's chevy cars. The little actuators and motors meet their life expectancy and the lifting arms are poorly deigned.