Ford 400 timing tables

[Dr_Grip]

I am splitting this off from my old/main thread in order to keep issues separate. With the engine finally running okay, I wonder how to set timing. I found the specs for the original distributor and tried to mold them into a base table:


On the other hand, the MAP reading when idling in D is 55 anyways, so I wonder whether it'd be better to bring all the (simulated) vacuum advance in before that:


Which one would you use as a starting point? With the bottom one I did not expect any pinging or detonation yet, "only" one backfire through the intake on a sudden kickdown from idle when not in gear (which might even be not connected to the advance settings at all).
But then again, due to the car not having a fuel tank yet I've only tested the engine in Neutral.

EDIT: Spark plug gap is set to 0.050, matching a Duraspark-equipped later year Ford 400 engine.