[JohnB]

I would go with the 150's. There is almost no weight difference 402 vs 466 pounds. The issue isn't so much of speed, but of how hard you work the motors. The 150's would probably last longer, and may get better gas milage at the same speed over water as the 115's. Once any of these motors hit 4000 rpm, they start sucking gas, fast.

I know someone that put twin 115's suzukis on a 23 sceptre, and regreted not going with the 140's.

I am still having problems with the thought of putting over 900 pounds of engine on the back of these 23's. The boats were designed/balanced for 350-450 on the back. Maybe the brackets make it work, but from a balance perspective, I would like to ride/drive one.