Gasoline Octane Suggestions

So, I run a 50/50 mix of 90 octane “rec” fuel, which has no ethanol, and 110 Turbo Blue, which has lead. I have a 440 in that car, and the big iron likes to have a fuel with a longer burn, which is the main property of higher octane fuel. I probably net about 102 octane or so, which is what was out at the time, I save my old parts from the ravages of ethanol, and the lead is good for the valve seats. It cost me $60 for 10 gallons, $20 for the Rec fuel and $40 for the 110, it seems to make my car run very well.