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Unless there's a tune, flex fuel running E85, and/or a O/D pulley on the S/C I don't see those numbers being realistic at all. Not trying to rain on your parade but, from what I've seen you'd need all three I mentioned plus what you've done to get in the 650 range. Even that SAE conversion seems waaay high.
For what you've done I would expect to see 585-590, max.
But hey, I wasn't there and it might be you have a unicorn.
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