Re: L78 tune up
Back in'66 I think GM was calling for .020 intake and .024 exhaust. By '70 they were calling for .024 and .028. Looser gives more bottom end torque. I run .022 intake and .024 exhaust with the stock cam. Our 427 ran almost 200K miles that way and our L78 about 30K since we bought it. Seems to work for us.
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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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