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I looked at your engine dyno sheet, it didn't gain much from 6500 to 7200, so you're probably safe at stopping there on the chassis dyno. I have seen a significant difference in the cars I've had on Dynojets and Mustangs dynos though, anywhere from 5-10%. Dynoing with the hood shut and everything sealed up will also give more of a "real world" result.
They are certainly useful for tuning though and finding out that the linkage wasn't letting the carb open all the way was definitely worth the money.
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