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You shouldn't need the lead additive with leaded gas. In the US, leaded gasoline hasn't been sold for a number of years. If you use too much lead additive, you will start to get deposits on your spark plugs.
I would use leaded fuel if you have a choice. In case the '52 GMC 302 doesn't have hardened valve seats (I don't know), the lead in the gas will act as a cushion to help prevent vavle seat wear.
One way to tell whether or not you have silicone brake fluid is to purposely drip some on a painted piece of metal. If the brake fluid effects the paint and causes it to bubble or wrinkle, you have regular non-silicone DOT 3 brake fluid. If there is no effect on the paint, you probably have DOT...