Re: Octane rating..Circa1970
A couple of times I got caught short and had to use some regular grade in our L72 car. Had to set the timing back just to drive it. Today, our L78 runs just fine on 91-93 octane. I've even had a fill up of 87 by mistake and ti got around ok. Mind you we don't try to run 40 degrees total any more either. I've always figured that the rating methods were somewhat different.
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Chevelleless after 46 years......but we did find a low mileage, six speed, silver 2005 Corvette. It will just have to do for now. 
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