Its a non-roller cam all stock engine. I have not driven the boat personally so not sure what it needs. Is the mercruiser cam and 4 barrell rochester adequate? Is the stock cam timing ok? the engine has a broken stock crankshaft-is this a common problem? and if so is it worth putting in a steel crank? It has the peanut port heads. Im not trying to build a race boat but looking for any easy upgrades while the engine is all apart. I dont know much about these beasts so any help would be apreceated. Please let me know whats a good bang for the buck. thanx