Re: worn out 150's
The 90's will be fine. in the early 80's, when I was at Waterway marina in Palm Beach Garden's Florida, we sold several '23 Seacrafts with twin 115's, and even one with twin 3 cyl. 70 hp Johnsons.
I believe the one with twin 70's did about 28-29 knots (33 mph) at WOT and cruised easily at 23-24 knots. It would NOT, however, get on plane with only one engine. The twin 115's would still plane 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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