I purchased a 1990 Eurosport 23 ft with a ford 1987 ford 460. I read the model on the stern drive and it says OMC 5.0 985271 which doesn't make sense. I don't know if the engine was swapped or the stern drive was swapped.I am trying to find out what stern drive I have so I can get the correct manual and check out the components for the stern drive. The ford motor was a high performance rebuild that spun several rod bearings. I am going to repair the engine and was wondering if the Stern drive mentioned will work and hold up? Thanks for any info