He must have been doing something that no one else knows about. Usually things like that can be duplicated. Records are made to be broken. Yes, I believe he done those times but if it is so easily done with hardly any upgrades I would suspect he would have a lot of people follow in his foot steps.
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78 Malibu 3.8 Turbo
Best 8th= 6.62@106 w/1.54
TURBO WONDER
Vernon Swindell, Jr.