Welcome John,
Good to see another 150/150 in the great PNW. Make sure you check into
PNWFlying [
pacificnorthwestflying.com]
Good group there....errr....watch out for Bill, however, he can be interesting

Bill and Dan from S. OR are both 150/150 owners and I am a former 150/150 owner.
Also, just for the info, I don't think there is an STC for the Power Flow on the O-320 equipped 150. I looked into that and it would have to be a field approval which, in our FAA District, is not likely. Might have to go to Alaska to pull that off. And the 160 hp....you probably have an E2D which as Gary pointed out is probably not eligible for the upgrade.
After you put floats on it, just install a climb prop and you will have all the ponies you need.