Just for reference, I have a 20' SF with an old school carb'ed Yamaha 200 that weighs in right at 400 lbs. I'm running a Mercury Mirage Plus 19P (I suspect its actually been reworked to 21P as I get negative slip numbers running a prop calculator). Anyway, my minimum plane speed is around 20 mph at 2200-2300 rpm. I max out right at 50 mph at 5100 rpm (I'm pretty sure I need to raise the height of the motor and come down in pitch to a true 19P). I have a fuel management gauge and can get 3.5 miles/gallon at 3000 rpm. Keep an eye out on ebay for a mercury mirage plus 17P. Should be able to get a used one for 200 to 300.
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