This ones for you propeller Garu's. Soon to test new power in my 272 Formula. Had t/330's turning 25 Mirages 4600/4700. Now have t/625's. Boat weighs 6800/7000 loaded.
I have access to 28" and 30" Bravo I's also (don't laugh) 27" Mach sterndrivers.
Engines are cammed for about 5000/5200 rpm
I think I need more.

Watcha think?

I think I would start with the 28's and go from there.
The 28's should put you into the low 80's and 30's into the mid 80's with the right slip #'s.

I agree with Griff start with what you have...and go forward from there. This will give you some Baselines to begin with.

Julie