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Which Volvo engines do you have? The V-6 with 275/290 drives? Those things run forever......So I think you might be getting bad advise on replacing them......Volvo stern drives cut a larger hole for their drives, but the drive it self does not put any stress in the transom, it bolts to the bell housing. So, if someone one wants to bolt a on a Mercruiser you can do a lot of wood and glass work, OR a company in Delaware (and others) make an Aluminum plate that covers the old hole and is pre-cut for Mercruiser.....It's a bolt on operation. Secondly, used drives are available, put some new bellows and hoses, and you can do this for a fraction of the cost to re-power, which I wouldn't do on a houseboat. I've also seen a single 50 HP outboard mounted on a bracket. It gives you mobility with out the expense of re-powering. Just my take on things. I hope you'll head my advise.