I just purchased a 1989 Sea Ray 268 project. It's been re-powered with a Marine Power 7.4 EFI. I'd like to find out what year the motor is, and find a manual for it. The tag has a model number E7.4V-MR2, and serial number 25983. The casting beside the starter is stamped G16389, and Z17752. Any information would be appreciated.