I am by no means a motor guru, but it is something to try. I am just going by one of my fellow hotrodders and good friends has a 468 big block with 427 heads buit with a blower pushing about 700 HP and he put pump gas in it and got to where it would not even fire. He started putting 110 octane in it and that beast came to life and hasnt had trouble with it since, except for the fact you cant drive it without burning the tires off it(if thats a problem)

. Now the motor that is being refered to here may not be built quite like the one im refering to but that was my experience.