I Just acquired a 1997 Robalo 2520 w/Twin 225's I am in the process of running through the boat from top to bottom. It is a single owner boat with very little use and I expect very low hours. I has been stored at a full service dry stack marina for since new 23 years. I am replacing the remote control with the new 4500 Mercury/Quicksilver series, the original command series is very difficult to move, cables are good and were replaced in 2018 when last serviced. Pumped out old fuel, scoped the block and cylinders, all looks good. Compression is good (cold) have not yet attempted to start the motors, that will be this coming weekend once all of the parts arrive. Any recommendations or suggestions of what to do and not to do? My plan is to replace the NGKs with Champion QL77CC's as the recommended plugs. Replace the fuel pump diaphragms, thermostats, belts, inline fuel filters of course the H20 separators. Lower unit inspection and seals (props haft, carrier assembly, and shift box seals) and water pumps. new batteries. More to come on my new born again project boat.