SF20 repower

[poco]

Hello

I have a 71 SF20 (open transom) that currently has a black max 150 on it. My situations changing and the boat will be living on a lake and run around only a few days every few month so i'm looking to re power and go fuel injected. If it was just me id keep the running black max for now but my some family will be running it from time to time so the simpler the better. I did search and read all the threads that related but most of them where ocean related conditions.

I've read a ton of great info on E-tecs and I know max 400lbs on the transom so I didn't know if a 90HP would be enough to motor 4 adults minimal gear day cruising at 40mph ball part.

Any suggetions would be great, thank!