The pedants will love this...
Define 'overweight'....
Will fly on all engines operating? Will fly with one engine failed, possibly with a propeller that is not feathered within 'X' amount of time? Will make a screen height, with or without such an engine failure, gear up/down as per the relevant requirements of the day? Even down to is it beyond the published certification criteria? Military or Civvie criteria?
Sorry...Not trying to be a muppet, but the Q is too vague to answer?
However, like all good Pprune questions, I'm curious as to an intelligent answer??