I just bought a Bayliner and it has a cracked block. The boat is a Bayliner Capri 3.0 liter Lumina Z34. The engine has stamped on it GM 86. The valve cover say's Model # 302AMARJ and also say's model # 98542.Is there a car engine block that I can use to replace the block or do I need to use the same kind of block.