Finally got my 360 magnum with Trick Flow heads running.

yellow rose said
This^^^^^^is the first step you need to take. You need to verify TDC so you know exactly what the timing really is.

Haven’t had a Pertronix box on my distributor machine yet, but I’d bet it has retard with RPM.

Here is a Sema video of the same box that you can change the settings with your phone.