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Unless the engine has been rebuilt it is about 9-1 compression and induction hardened valve seats. GM dropped the compression on their whole line in '71. They were developed to run on regular unleaded gas.
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The engine has a fairly fresh stock rebuild with the exception of smaller combustion chamber heads. I'm thinking it's probably 10 to 1 now. I might get away with 89 octane in a pinch if I keep my foot out of it. I will only run that if I have to even though I'm not going to run it hard. Well, at least not until I'm within 100mi of home
