Yamaha F300 or F350?

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With summer winding down it's time to start looking at an overhaul of the 1972 23' cc. After a complete rebuild of my 18' sf in 2009, I ended up buying peterB's old 23' from a guy in atlanta. I've fished it for two seasons now off the carolinas and just got back from Big Pine for mini season. The old girl is looking a little rough and I'm starting to think about a refresh this winter. While I do enjoy the old 2 stroke 200 ox66 motors, they are kinda thirsty and I'm starting to get tired of the o2 sensor issues. I'm thinking of selling the pair as they are still relatively low hour motors and should still have decent resale. If I do, I will sell the bracket as well.
I REALLY like the hermco that i put on my 18', so I was thinking of a hermco twin bracket and one of the big four stroke yamaha's. The f350 wouldn't outweigh the twin 200's, plus the hermco bracket would have better floatation than my currrent one. I have no idea what make it is, but it has a smaller offset than my hermco.
I'm just kicking around some ideas for cold weather. As always, any thoughts/ideas would be appreciated.