Re: '69 L78 Chevelle performance in 1/4 mi + top speed
Our '69 was pretty low option and weighed right on 3700 lb. with half tank of gas and no one in the car. A lot of options could add quite a bit to the vehicles final weight. The parts catalogue shows weights of various options to be used to calculate which springs you would need. 300 pounds of options added up pretty quickly. Tuning alone could probably knock a second off the as delivered times.
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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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