That's a good way to kill performance. Invent a time machine and go back to the days where you could get leaded Sunoco 260! They still make it minus the lead. What you need is either higher octane or Tetraethyl lead or both. Lead was a major ingredient to stop pre ignition(not to mention it's lubricating properties) but is no longer in automotive gas. It IS still in aviation fuel (Avgas). Any aviation fuel has higher octane than what you find at your local gas station. Back in the day a local Sunoco station had race fuel available right next to the standard gas pumps. Don't think you will fine one like that today.