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Have you done a compression test? Maybe that 307 has lost just enough to poop out at higher rpms pulling a load. You wouldn't notice any difference standing in the driveway buzzing the throttle because there isn't any load on it.
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'70 cab, '71 chassis, 383, TH350, NP205.
'71 Malibu convertible
'72 Malibu hard top
Center City, MN
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