You are rebuilding the rear of a 28ft cigarette boat and can't decide whether to put 1 Mercury 454 engine with a bravo outdrive or twin 350's Any advice on which would be better?

This is a very good question and a few things should be cleared up before you attempt the project. First what is you budget. Because if there is no budget twin Chevy small blocks with blowers would most likely be the fastest most expensive and the most to maintain. Not to mention how close the engines will be shoe horned in. A single engine is the most likely the best way. Less to maintain. Less to operate. Less to break. Almost as fast and will have a lower center of gravity and sit higher in the water. I have a 28ft cigarette set up for a single big block runs 68mph with single big block 485hp 4 sale