I ran twin '83 Evinrude 235's on the transom of a 23 SF back in the mid 80's. Great to get on plane easily with only one motor. handling was fantastic, even with both RH rotation motors. The weight was no issue, hull was rated for 500hp. It was still self-bailing with the older lighter V6 motors.
Fuel economy sucked. Averaged about 1.2-1.3 mpg, never got more than 1.7 that I know of, and that was a single long run from Palm Beach to Sebastian at about 25 mph all the way, offshore on an extra-smooth summer morning. (I did that because the trailer was broken).
I sold that boat to the town of Palm Beach and they had me put twin 150's on the back, and it performed fine, planing easily on a single engine as long as you tilted the other out of the water.
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Common Sense is learning from your mistakes. Wisdom is learning from the other guy's mistakes.
Fr. Frank says:
Jesus liked fishing, too. He even walked on water to get to the boat!
Currently without a SeaCraft 
(2) Pompano 12' fishing kayaks
'73 Cobia 18' prototype "Casting Skiff", 70hp Mercury
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