I don't see how the cam to crank timing has any bearing on the ignition timing?
timing is set by the crank with the light. the distributor does not care where the cam is set.. when the pickups align in the distributor, spark is generated when the crank is x degrees BTDC. no matter if the cam is -4, straight up, or +4, if the pickups in the distributor are aligned, you get a spark..
unless I've misread what you are saying? and perhaps you mean that having the cam advanced will create the need for excessive advance?
btw.. I know how things get lost in translation on the internet.. I'm not trying to argue.. just trying to understand!