With the same cam/heads my car runs well with 91 octane , never tried anything less. However, when running less than 93 Octane from the local BP station, I do experience engine run on or diesleing. Base timing is 12 degrees at idle, so not entirely sure what is up with that... 93 takes care of it, so have not pursued any other remedies.
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68 Firebird-- Street/Strip - 400/461 Eagle Forged Bottom End & Ross Flat top pistons. KRE 325 CFM D port, Ultradyne 263/271 @.050, .4267 lift. Crower Solid roller lifters and 1.65 stainless rockers. Quickfuel 1000 on Torker2 intake and 2" open spacer. Hedman 1.75" headers. TH400 w/brake. Ford 9" w/3.80 gears & 28x9 Hoosier pro bracket drag radial. Best ET: 1.35 60ft, 6.29 @ 107.20 mph, 9.99 @132.33 mph. 3,300 race weight
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