Put this engine in the dart last week and I am very pleased with the performance. I have some fine tuning to do yet but this thing screams. I'm surprised at how this engine rpms it will scream to 7000 very quickly I figure with my home ported sm heads would choke the 408 but it likes rpm. I have to watch the tach closely because I want to shift at 6500. Saturday will tell as I will be at test and tune and bracket racing.