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Hello Fire Dragon and glad to see your on W/C. Never mind which current mounting hole position is in use, how far above the keel center-line is your outboard's cavitation plate.

Make certain before measuring that the cavitation plate is as possibly level with the keel, a carpenter 4 foot level will be very helpful (as a straight edge and gage) during this process.

What is the weight of your F70? Current location of battery (for weight distribution)? Fuel capacity curiosity?

F.D. if you look at my signature you will note my Dauntless is over-powered but not by much. I feel these whalers where offered somewhat underpowered when available from the dealers. 4 adults fish or swim gear and they will struggle in a light to moderate bay chop with some of the small outboards I have viewed them with on the web.

Your F70 should be a torquey "son of a gun" and good on fuel, yes? Rule of thumb with "Prop Pitch" changes is, for each inch of increase 150-200 rpm decrease and just the opposite when decreasing pitch. These are simple guide lines allow for varibles with this calculation. I am currently going to test a "new to me" stainless prop on my Dauntless, from Power Tech 13" Dia. x 17" Pitch but a "Semi-Cleaver" type which should afford me better stern lift. This prop is modeled on Yamahas "OEM" Semi-Cleaver offering (typically painted in black).

Do you know what size is your lower-unit's gear case? 4.0 inch, 4.25 inch? Just currious, mine is a 4.25 inch I recall that being considered medium size.

I'm not to far North of you F.D., local Miami boater. Matheson Hammocks Marina is my desired launch area. Hopefully Tom will offer a suggestion to your inquiry.

Angel M.