[ERA Chas]

You don't need more octane unless you have over 11:1 compression and run over 38 degrees advance. I doubt you do. Race gas is a much better solution instead of booster if you did have the need.
You don't need lead substitute if you have hardened valve seats, which most aluminum heads do these days. Even if you don't have hardened seats, it will take 50,000 miles for the valves to pound out the seats. At that, seats can be cut and hardened seats installed easily. A valve job at 50K is no crisis.
Don't handle lead anything-it's bad for your tummy.
... and I'm not fooling you.