Can some one tell me what the part number is for a Mercruiser service manual for a 1988 454. I know I should have the serial number from the engine but I can't get it right now, the boat is an hour north of me. Thunderbolt ignition not fuel injected. I've looked on e bay and just want to make sure I ge the right one. Has anyone bought one of those manual's on cd and if you did was it worth it. Thanks for any help, when I get the boat home I'll get the serial number.