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I have a 1973 23' Tsunami that had twin I/O's. I've pulled the engines and closed up the transom.
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The pictures look like a center console, not a Tsunami, did you convert a Tsunami to a CC?
If the i/o cap is the same as the inboards, I don't think you would have enough room inside it to put a livewell. I built a cap on the back of mine that has 17" inside so I could put the livewell in there. I will shoot some pictures this week, and post them.
A 250 moves at 23' along just fine, a 300 is even better, and might get better gas milage since it doesn't have to work as hard, especially at cruise. My boat is very heavy, and with a Merc 250, I cruise at 27 and wot at about 40. The top probably takes at least 2-3mph off, especially wot.
As for the bracket, a "bumpout" transom is a tough fit. If your looking at twins, I don't think there is much of an option other than the hermco. You need to add a bunch of floatation for that to work right. For a single engine, a DnD, Armstrong, or stainless should work fine. Just make sure it has the max floatation available, since the 300 is a heavy motor.