The car has been modded from the stock '89 240fwhp, to 375. Since the stock LV8 values were determined at the lower hp value, should I raise or lower the scalars and tables relying on LV8?

Example: LV8 spark tables should delay advance from stock since the engine is now more "efficient" in producing power, i.e. more power is being made using the same fuel. I realize I could be stating a bunch of blarney.