There is one method to which an over torque on a 331 is quite certain however. That is to activate the water methanol once you are producing over 40% torque.
I have seen the engines produce over 120% for a transient period after such an error, however it was not necessarily sustained for a prolonged duration.
The RPM of the shaft is more concerning measured as a % of RPM. From memory without checking my old flight safety manuals if you produced over 106% rpm you were required to remove the engine. They were quite prone with the speeds at high rpm in a cruise climb to exceed 101.5% quite rapidly if the error was not caught.
A real mans aeroplane the metro and after flying such, your scan and manual flying skills will never be greater.