27 Power question

[3rdday]

I can shed some light and perspective.
My Flybridge had a bravo 454 310 hp.
I did some reading on a similar boat weight with a single etec 300.
On my 27 i believe the single etec would be an advantage- set back on a bracket;
Running in cleaner water 10-15% advantage(what ive heard over the years)
Weight difference- 800#s lighter tha 454 with I/O
Advantage of two stroke vs 4 stroke two stroke delivers power on every piston stroke.

My concern is load on the lower unit gears.