Re: repower
The 20' Seafari is even heavier than the CC, and will run just fine with a 115. My first Seafari was a 1973, 1830 lbs hull weight, dealer equipped with a '74 115 Mercury. Cruise was about 24-25 mph, top speed was about 29-30. I repowered with a '77 1500XS which gave me a cruise of 34-35, and a top speed of 45-46 mph.
My current Seafari is a '72, hull weight is 1870 lbs, and I got it with a 1972 Chrysler 120 hp. It planed easily, cruised at 22-23 mph, and had a top speed of 26 mph. I installed a 1991 Mercury 150 XR4, with the big gearcase and a Bob's nosecone. Top Speed light on fuel with just me is 46 kts on the ol' GPS, which I think is about 51 mph. Cruise is 34-35 mph, just like the 1500 XS. I have a higher top end with the V6, but not significantly higher. The real beneift is that the XR4 is better on fuel.
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Common Sense is learning from your mistakes. Wisdom is learning from the other guy's mistakes.
Fr. Frank says:
Jesus liked fishing, too. He even walked on water to get to the boat!
Currently without a SeaCraft 
(2) Pompano 12' fishing kayaks
'73 Cobia 18' prototype "Casting Skiff", 70hp Mercury
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