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Anything equal or greater to 87. I use 89 in mine. It has been proven you get better performance with 93 octane. I don't get in many races on my way back and forth from work at least not the ones where an extra 10th is gonna help.
At 89 I get better mileage...
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My first Love. She was called "Miss Carriage" ( still cry when I think about her)
383, Muncie 4 speed, custom linkage mated to hurst short throw shifter.
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