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Hello my name is ***** ***** am I speaking with?
For the most part engines horsepower is maxed out when the engine leaves the factory. What kind of problem are you having?
What is the model number on your engine?
They do use the same engine block up to 250 horsepower. So theoretically it can be converted to a 250. However, the engine would have to come apart and the engine blocks porting would have to be machined by a machine shop capable of doing the work. Realistically it would cost you more to have done than the engine is worth. On top of that the carbs would have to be rejetted.
Did you have any further questions on the issue, or were you just curious as to what had to be done to get more horsepower out of the block?
I'm sorry I don't quite understand you.