Running $58 on a repinned '730.
In the $58 the Reference Spark Angle is set to 0. Being a stock L98 w/reference SA set to 6, should the $58 reference angle be changed to 6? If so, would I need to change the Spark vs MAP table to compensate by adding 6 degrees to the whole table, or should I leave the reference angle to 0? When adding 6 degrees across the table it makes the timing look very aggressive. Just needing some direction...

 

Set it to whatever initial timing your running.
It depends on what software your using. If you change the reference angle and see no change in the timing table, then you need to remember that it's not accounted in the particular software your using.

It's always good to set all the timing in chip to some constant amount, and then verify that with a timing light. Assuming everything is right can be dangerous.