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 - History of the Nuffield Tractor - by Anthony West. The Nuffield tractor story started in early 1945. The British government still reeling from the effects of the war on the economy, approached the Nuffield organization to see if they would design and build an "ALL NEW" British built wheeled tractor, suitable for both British and world farming.
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