Re: LS6 L78 4557 jets??
I don't know about '70 but our '69 COPO Chevelle came with #68 jets in the primaries and #76 in the secondaries. There was noticeable lean surge at 60 mph.
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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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