The Dart has been several mid to high 50's. The Cuda went a few 55's at Atco a few years ago for the record. I believe he held the record at 8.554 @ 155.87 until it was reset the beginning of this year. I don't think we've seen the weather/track they had there since then.
I can tell you this much, that Dart is one bad hombre. It takes everything we can throw at it, and says thank you.