The reason you don't hear a lot about older engines having problems with unleaded gas is that most of them have had a lifetime treatment of lead. But once you grind the valve seats, you're back to bare iron.
Supposedly, if you run an engine on leaded fuel for ten hours or so, it will have all the lead it needs until overhaul. Of course the only leaded fuel available is 100LL avgas, and it will probably go away in a few years. But you might try running a couple of tanks of avgas through your engine after you re-do the valves. I'd say that's more likely to work than any snake oil "lead replacement" additive.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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