Looking over the pictures, here are my opinions for the things I feel comfortable answering... if it were my tractor.
I would replace the govenor cover. It's not seating right, and I bet is an easy cheap replacement that will save you some heartache.
The oil filter leak looks like a leak around the push rod chamber plate. I bet it has a bad gasket and is easily replaced. I'd pull the filter cover and filter and make sure all old gasket rings have been scraped out of the bottom so you can get a new fresh one in there. Pop the chamber plate off and give the breather pipe assembly a look-see.
I personally wouldn't remove the belt pulley. I doubt I will ever use mine, but you never know. Plus, I don't think the tractors look "right" without them.
If I was doing what you are doing to that tractor I pull pull the transmission cover. I think I've read that guys fill them with kerosene to clean them out. Now would be the time to get the crud out and give the gears a good hairy eye ball to avoid future problems.
I'd replace the whole fan assembly if the springs by themselves can't be found. Although I have no idea what they are for.
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