Borrow your buddy's tires and give it a shot. Also, you may be shifting a bit out of the power band of the motor at 5,800 - may want to play a bit and try a lower shift point. for what its worth, y car slowed down when i shifted much past 5,300 Good Luck!
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1965 K code coupe - numbers matching - restoration ongoing. 1987 LX notch, stock heads and intake, 3.55's and typical bolt on's 13.89@100.25
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