It would be a mistake to think of your new ignition system as being a 'modification' in the sense meant in the quoted text, that sense implying some significant change in the engines volumetric efficiency (i.e. ability to 'breathe', e.g. cam change and/or porting or supercharging or boost change etc etc etc), and / or an increase or decrease in compression ratio.
With a stock engine (i.e. less than very substantially modified) an 'upgraded' ignition system will have zero affect on performance unless the system it replaced was in some way faulty, and will require no change to the timing.
Really, just set it to the factory spec, or set it on a dyno (shouldn't take long just to do the timing, shouldn't cost much).
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