Your engine died on you, but you are not sure exactly how many of the components are toast. The answer when you go to purchase a replacement is to go for a 350 long block, rather than a short block. The reasoning behind this is that the long block is a complete engine, including parts such as an assembled block, camshaft, crankshaft, valve train, and valve covers. If your block is the only damaged part of the engine, however, then a short block may be all that you need. Marine engines work the same way in that a 350 marine long block also includes the complete engine. Long block engines, however, do not typically include the fuel system and exhaust components that help the engine to run once it is installed in the boat. No matter what additional parts you need to get your 350 long block back in gear, the vast inventory on eBay means that you have plenty of options. Stop stressing and start repairing, and before you know it you will be cruising the streets and waterways again.Shop the extensive inventory of motors, parts, accessories, and complete GM car and truck engines!