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How far can you go with compression to stay with pump gas?

It seems that 9.5 or 10 will cut it but what's real world on todays gas with a mark IV 454 in a 70's muscle car?
 

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Now I understand why that 'ol man' said I better keep my compression under 11.1:1 if I wanted pump gas with a cam smaller than 230deg duration...

WOW.
 
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