ZX7R Sick Engine

Well the post-theft damage report on the poor 7 is in and its a mixed bag.
My main concern currently is the awful running of the engine.
The mechanic explained it was running like ass because it had been laid on it side and oil had gotten in somewhere it shouldn't have (I can't recall the component but I'm sure someone knows what I'm referring to).
He said that basically the engine would sort itself out but is this sound advice?
The engine is down on power
Power isn't smooth even when holding the same RPM
Prone to stalling/poor take off
It sounds like a drag car (in a bad way)
Suggestions?
My main concern currently is the awful running of the engine.
The mechanic explained it was running like ass because it had been laid on it side and oil had gotten in somewhere it shouldn't have (I can't recall the component but I'm sure someone knows what I'm referring to).
He said that basically the engine would sort itself out but is this sound advice?
The engine is down on power
Power isn't smooth even when holding the same RPM
Prone to stalling/poor take off
It sounds like a drag car (in a bad way)
Suggestions?