Lean idle. Rich cruise.

9secRR said

Locked out at 37* at idle which is at 1500 rpm.

Trans brake

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Ok, I doubt you have 37 degrees at 5800 and up. And probably less than that even at lower RPM.

All ignition boxes retard with RPM. They don’t retard at the same RPM and at the same rate, even comparing boxes with the same part number.

Other than not knowing exactly what the timing really is, you’d probably be one of the few I left locked out. But that’s pretty rare.

If you were foot braking it, I’d probably still have a curve in it. Getting from low RPM at the hit to stall speed goes much cleaner with a curve.