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why????????? Starting in 1971 GM went to hardened valve seats and since then it has been proven unless you really stress the engine, racing, pulling a trailer up a hill, etc. nothing happens to the seats due do to lack of lead.
It has proved to be a Myth, even the earlier 1970 and older V8 engine withstood the lead free gas 99% of the time. Don't waste your $$$ on any additives. Also the 1973 engine you have is a low compression engine, they do very well on modern gas,
What does not do well with modern gas are any original flexible fuel lines, and the accelerator pump seals in the Carb.