Excellent motors and in the top 3 OMC motors, in my opinion. How does the lower unit oil look like? If there is no water intrusion, consider yourself lucky. However, it wouldn’t hurt to replace the shift rod O-ring. That is usually the leaker. The CRS seals are pretty tough and hold up for years. Chicago Raw hide Seals, I believe.
How do the coils look? If they’re cracked, then they’re in need of replacement.
Impellers should be replaced, for piece of mind.
Along with what you have already done, that’s really about all you need, to make it reliable. Most would recommend a carb rebuild, but shouldn’t need it, if it’s been properly stored. Those carbs are pretty reliable if they have been treated right and I’ve had really good luck with them. I’ve had to rebuild very few of them, considering how many motors I have had pass my hands. Oddly enough, most issues with running correctly, are because of faulty or aged ignition.
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