[willy]

I would not do it, because of what Ferm just said but also an assumption that you are gaining a good chunk of weight. That is never good. I do not know the specs between the two.
When you add another 100-135 lbs for a kicker also sticking out on a adjustable mount I think two three things will happen
1. Your bank account won't look so good
2. You will love the power and you will play with it a couple of times like a hot rodder but you will not use it much after that unless you are like Skools and like that G force facial expression he enjoys.
3. You will not like the arse heavy set your boat will take nor the porpoising you will experience and have to correct with a lot of positive trim tab.

Besides with all do respect to the four strokes out there which I love to you have one of the most reliable and best built engines ever put on a boat already with what is considered by many to be the ideal horse power rating.
JMHO