Without wishing to be pessimistic (and in no way trying to teach how to suck eggs) I can tell you from (expensive) experience that Lycomings are more susceptible to internal corrosion problems than Continentals due to the design of the internals.
Your oil changes may have helped keep the rust at bay but generally, running an aircraft on the ground to circulate the oil is one of the worst things you can do - you really need to get the oil up to a proper operating temperature. Turning the engine over for a short period just increases the internal condensation. A google search will find this advice from Lycoming.
Your cylinder walls may have a light coating of oil, but I would be concerned about camshaft, crankshaft and valve mechanisms. There's lots of advice on the internet but it would seem that the best thing to do is fly the aircraft as much as possible - although that's a bit late now!!