Looking at a boat that has a GM 4.3 from a Blazer installed because the Mercruiser engine was trashed. They said they paid $3k to have it professionally installed and converted. I know one difference is the cam and head gaskets are different, but i guess my main question is this a boat to walk away from? Or will it be alright? Just makes me nervous that they did not install an OEM motor in the boat. Thanks for the help!