What motor size can i use ?

[cadeco]

Hi guys !

I bought a superfisherman 20' 1983 an it has a 150 hp Johnson ( 25" shaft). Recently someone offered me a 200 Mercury w/ a 20" shaft. Right now the boat has a cut out transom and i will close it to have a bracket installed. Question would be any problem to use the 20" motor ? I have read that many times when installing brackets, the owner would have to raise the motor, so tht's why i'm asking.
Thanks for the answers.