Yes, I understand. But most of the events that PIR runs are using street cars or modern racing series that use lower octane fuels.

But there are also certain events where people are absolutely bringing out 40-50 year old drag racers.

I don't believe that particular product you have linked to has been on the market for over a decade. I suspect the additives they used in place of lead were probably even worse. If you can find an unleaded racing fuel above 110 octane for sale today I will happily eat my words.