93 trophy or 83 grady? in This Old Boat Posted February 19, 2014 Sounds like the Grady is older and has too many unknowns. I would not touch it if the outdrive is an OMC. Some of those boats also had problematic merc 470's and I would stay away from them as well. Closed system cooling with small heat exchangers and stacked water pumps as well as a gererator instead of an alternator. I would repower the Trophy. I have a 83 wa2002 and the best part is a previous owner repowered it with a 1999 175 Merc.