Yes, mixing 93 and 110 turned out to be the best for performance. The lead additive is a good substitute for those that do not have a choice because of limited access to the 110. It would be good to use the additive now and then if you have stock heads. The lead will build up a film and protect the valves and seats. It doesn't take much lead to get a good protective film. And it will last quite a while once the film is there.
