Sorry, rickg has already claimed the Apollo. You wouldn't be able to spin it over 5200 on your Seafari anyway even with a very light load. You have the exact same rig as I do and I couldn't spin it over 4600 with 6 folks in the boat!
You might want to try the 4B Aluminum Vortex I have. I can turn it to about 5400 with a heavy load and it will plane the boat at ~12-13 mph!
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