hold on a minute...check with a top notch head guy and see how much those chambers can be opened up on those heads combined with a thick head gasket you might can get it close enough to run on the street with some 110 and 93 mixed.
i mean you want a good running street engine that has some pep..not a slug..right ?..i have run 11:1 street engines..and they ran GREAT...RAN 110 and 93 mixed.
i have always said if a man is stretched for running decent gas for his Hotrod, then he might want to re-consider Hotroding and take up chess playing..
i am poking at ya a little but on the other side i am serious also.
check into the head work before diving in head 1st
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Bjuice..
"I'M YOUR HUCKLEBERRY ! "