Worth a try anyway. I'd try a mix of 110 and 93 see what happends. After that bump the timing and see if you get any more out of it. I found my old 95 5.2 Dakota sport ran better and stronger with a mix of 93 and unleaded 104. I was told that was because of the computer advancing the spark and dumping more fuel. I think those motors are like 9:1.
On this car (11.2:1 440) I run a meth/water injection kit and 93. You can defenitly tell the difference when the switch is on.