There is absolutely no substitute for the tetraethyl and methalethyl lead for octane in gasoline compounds.

I have a new to me 66 c10 with a 327 that kinda down on power. Edlebrock carb which I am not accustomed to. I have thought about getting an o2 meter to help me hone in on the proper tune on this thing. Or just throw a holley on it. LOL.