Base Timing Questions

MV8 said

I've experimented with full manifold vac advance and it does run very well until you open the throttle, then the quick timing swing causes a stall, so I settled for normal.

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That is not "normal" behavior. As the throttle is advanced, the vacuum the engine produces drops thus the vacuum advance drops off as a result. As the engine RPM's increase, the mechanical advance comes into play which makes up for the loss of vacuum advance timing. Some vacuum advance units can be adjusted to increase or reduce the amount of vacuum needed to bring in advance.

Opening the throttle should in no way cause a stall because of "quick timing swing". Something else is going on with your tuning to cause that.