The tank that came out of my 1985 23 was 115 gallons. We had an identical tank built for the rebuild. My power is an F250 yamaha on a 30 inch transom with no bracket. I have a bulkhead in the splashwell with a door that goes up. We left the deck the stock height and have no problem self bailing, and my deck stays dry all the time.
My boat has seen 47 mph with 2 men and light fishing gear. A heavy load, 42 is about it. Last season we steamed out slightly over 40 miles, trolled all day, steamed back in with a box full of tunas, and we burned about 47 - 48 gallons of fuel.
A 150 gallon tank isn't going to weigh that much more than a 100 gallon tank to make a difference, empty. Just because you have 150 doesnt mean you have to fill it. Better to have the capacity and not need it, that need it and not have it.
Think about what you are doing with the boat and make the appropriate decision. Have a buddy that has a 23 with a 90 gallon tank. Its strictly a nearshore boat and has a 250 4 stroke and he has no complaints at all.
FWIW - if you dont need to go 50+ mph, a single 250 is all you need on that hull. I cruise about 30 mph getting 3.2 mpg.
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