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Regardless of what I think of the Avon 560,I don't think
it's rated to fit a 150hp on which could mean strutural issues. Check the maximum HP rating.
I suspect one of the others would be a better bet, but it's down to condition.
What's the Mercury on the Tornado? 4 stroke or Optimax? Has the Tornado been retubed?
What conditon is the Humber?
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