You probably could go with a pair of 90's and still do displacement speeds with ease. Handling won't be as good, outboard props (exhaust through prop) are not so good in reverse. Had a house boat next to me for a number of years, he made a really nice bracket for the outboards, but when he was backing in looked like the water was boiling and alot of revving. Final note, resale would be in the toilet.
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