A guy wants to sell me a motor. He says it's a 1988, 175hp, v-6. S/N is 0A181325. My research shows that this serial number range could also be a 150hp but definitely not a 1988. MercPartsExpress says it's a Mercury 2.4L, Model 1175745, but does not give any more info. Called a local dealer but they could not help. Anybody out there that can solve this? Or do I have to look at the carb numbers?