I have a '66 389/4bbl with an Edelbrock Performer package, 10.5:1 CR. I run premium unleaded with one quart of xylene. Car runs fine, no knock. I have also heard that you can run with one gallon of kerosine. Seems the new clean-burn additives in pump kerosine work fine in high compression engines. I haven't experimented with this one, yet.
Good luck.
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