Hi; A few years ago,I had several Kaisers and Frazers...And at the time there was a great concern about the additives in the gasoline ruining (or being bad )for the stock valves.....At that time I used gasoline additives (lead) to help preserve the engine,,,Also the same problem existed for the fuel pump gaskets...Now I have a 54 Manhatten...will these precautions be needed for this car? Thanks for all the knowlege you all share,,