Wallace Racing has a calculator that will calculate your octane rating for a particular mix. I am currently running 110, on a 11:1 iron head 451, but at $8.50/gallon I am going to investigate trying a mixture which produces a 100-105 finished product. At 50/50 110 to 93 I can get around 102, which I am hoping will suffice. My effective compression is only 9.50, so I am think I should be ok.
'75 Plymouth Duster Phase I 451 906/590/2-660 10.75/126 Phase II 451 Stage VI/590/1050 9.82/135 Phase III 383 906/Victor-Pump gas 11.30/119
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