So I have a friend who drives a 98 Moomba Ski boat. The boat has a Vortec 350 in it. He blew the impeller and for some unknown reason decided the best way to fix it would be to rev the motor up and drive as fast as possible. Now as you would expect he has a cracked head and block. Anybody know of a cheap longblock out there for sale. He would buy a whole motor if the price was right. He wants to put the exact same engine back in it. Another problem is he has a bunch of rednecks working on it. I need to know if there is any difference between the marine and street version of this motor he should know about. They think it is exactly the same and are going to buy a block for a car, IÂ’m no mechanic so I want to know the differences between the street and marine application if any. Thanks for the help.