Re: 1969 L78 Calif. Emissions
For what it's worth, our COPO Chevelle was built the last week of July. it had the smog pump, retarded timing and leaned out carb. #68 primary jets and #76 secondaries. There was a definite lean surge at 60 mph and performance was pretty bad. The breather base was the same as that on our February L78 car. Just the curved tube for the pcv system to the valve cover.
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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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