You can get some real horsepower out of the mercruiser, but they have their issues like all engines. You can get them used on boat forums all the time, but those guys are a little prouder of their stuff than we are. There's a guy in florida that has a turbocharged one in the 7's, but he cracked a lot of blocks getting there.

"The first rule of overkill: You can never have too much overkill."
"Overkill is underrated."