The two L78 cars that we have/had would probably run mid to low 13s. They both had headers and appropriate tuning. Nothing spectacular considering all the good equipment involved. The gas mileage was no better that our 427 which did perform pretty well. The actual compression ratio tended to be about a point lower than that listed. I was told by a fellow with several COPO cars, that these engines were honed to the outer limit. This is what accounted for their free revving at higher rpms. Ours certainly didn't fall off over 6K like the L78s did.
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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.
