Mark is right on the money. I forget what year lead was added to gas but prior to that ALL gas was lead free. I've read in restoration books that lead substitutes are a waste of money, especially if the car is used for only short jaunts. If I were to take my car on a cross country adventure, I would use it. There's a reason mfgrs are putting hardened valves and seats in engines today...
If your engine was rebuilt after the mid 80's, it probably has hardened valves and seats in it.
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