first off you need to know how much cash you have and can spend on your motor,don't try to build your motor by buying item by item,it will cost you more !your profile says your in calif,thats good because some of the best engine guru's are in calif.you might call,greg shoemaker,wilkes marine,pfaff racing,teague marine,these guys will get you in the ballpark for cost.parts are not the biggest cost,prepping,machining,setup do cost to have it done right.and most important marine engines are set up different than car engines!!!!!good luck.